This is a cryptic crossword. Each clue contains an extra letter which must be removed before the clue is solved, leaving real words in place. Solvers may find a use for these letters. Each corrected clue consists of wordplay for itself, and a definition (not necessarily in that order) for a different clue. Solvers will need to put the definitions and wordplay back together.
To obtain the green tick solvers must complete the crossword and indicate what the clues should be when the correct wordplay and definitions are matched (this can be as simple as noting next to each answer which clue contains the correct definition).
All answers are in Chambers dictionary except for certain proper nouns which can be easily found online if all else fails.
Across
1. Rat meat puree cooked for bald soprano playwright (11)
9. E-mosaic instructions: regular choice of Rouen's ignition (3,4)
10. Revolutionary gorilla, for example? Bright loss of memory (7)
11. It goes bang! from the yeast, shields core (3)
12. Woman: win Alaska's passage across (7)
13. Brief cinematic flashies of tale of feeling sad (3,4)
14. Very odd, maybe Hearst, in the morning (3)
15. Ex-frat arrangement: dead musician (5)
17. Emit light din lacking purpose (5)
18. Organic compounds force respiratory organ to close luminance on island (5)
20. Strategy Ptolemy embraced: four Alton Towers, for example (5)
22. Then conclusions of more scientists: scrap knitted fabric (3)
24. Soldiers heading after one mile haps subordinate (7)
25. Arcadian descendant suspends Rouen cat over Vichy water (7)
26. Black holly or good confused ape (3)
27. I am sane, disorganised, and bit's costing less (7)
28. Fakir must take heads of indian cobras explains poor man (7)
29. Telepathy maybe sent about test kit once (11)
Down
1. Overleap with Order-soldiers drinking Spanish wines? Just the opposite! (3,12)
2. Resit (horizontally) of megaton explosion (7)
3. Ken Olsen chides mushrooms (5)
4. A North Carolina particle about misfortune has line for vast extent (9)
5. Refuse lessons, essentially dare the act of polishing (7)
6. Garland's contorted evil sexy piece (VoD) (9,6)
7. Kinky coast found beneath tops of fetishists "rump-embracing articles" is tuber (6)
8. Half? More than anticipated (6)
16. Statue of equality has King following recurrent idea to North African country (5,4)
18. Vegetable, pickled as pods, woman surrounded by young fish (6)
19. Jupiter moon company absorbs Ganesha's essence for average akinetic energy (7)
21. Wart isn't reforming waterproof jackets (7)
23. Magistrate's fork everyone trapped in receipt or bill (6)
25. French Castler starts cooking andouille jambalaya, uniting neighbours (5)
For people unable to see images a version where . represents an unfilled cell and * represents a black cell is presented below; numbering should be inferred.
**...........**
.*.*.*.*.*.*.*.
.......*.......
.*.*.*...*.*.*.
.......*.......
.*.*.***.*.*.*.
...*.....*.....
**.***.*.***.**
.....*.....*...
.*.*.*.***.*.*.
.......*.......
.*.*.*...*.*.*.
.......*.......
.*.*.*.*.*.*.*.
**...........**
