Crossword Genius

Behaving badly (6,2)

Ross

I believe the answer is:

acting up

'behaving badly' is the definition.
(acting up is a kind of behaving badly)

This is the entire clue.

(Other definitions for acting up that I've seen before include "Misbehaving" , "Behaving badly" .)

I've seen this clue in The Guardian and The Telegraph.
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