Crossword Genius

Be mischievous cat playing in high place (3,2)

Ross

I believe the answer is:

act up

(Other definitions for act up that I've seen before include "create fireworks display?" , "Informally, behave badly or cause trouble" , "Behave badly, give trouble" , "take part in heightened drama?" , "Behave like a brat" .)

I've seen this clue in The Sun.
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