I've heard this rhyming riddle recently, and I just can't work it out. What am I thinking of?
My first is in cow, but not in pat.
My second in mouse, yet not in rat.
My third is in rhythm, but not in rhyme.
My whole is a waste of all your time.
Clue: This has now been answered, but here's a clue, in case you're struggling...
The answer is hiding in plain sight.