Crossword Genius

Find doing something they shouldn't and dismiss (5)

Ross

I believe the answer is:

catch

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'dismiss' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for catch that I've seen before include "Snag - trap" , "Dismiss (batsman); break (in voice)" , "Fly in the ointment" , "Apprehend - funny song" , "Capture; hidden problem" .)

I've seen this clue in the Evening Standard.
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