No back story, no setting, no theme, simply a cryptic clue to solve:
One large cake performance
Since cryptic clues traditionally indicate the number of letters in the solution, I'll provide that as a hint:
This may be British English specific, possibly even dialectal. I'll make sure I avoid this in future clues.
Criticism is welcome as I plan to publish a few of these and I'd like it if the the future ones are better