Crossword Genius

Give trouble (3,2)

Ross

I believe the answer is:

act up

(Other definitions for act up that I've seen before include "Become unpleasant" , "Behave badly, cause trouble - like thespian?" , "Behave like a brat" , "Mess about" , "take part in heightened drama?" .)

I've seen this clue in the Evening Standard.
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