Play up (9)

I believe the answer is:
misbehave
(Other definitions for misbehave that I've seen before include "Conduct oneself badly" , "Act without propriety" , "Act badly" , "mess about" , "sin" .)
I believe the answer is:
misbehave
(Other definitions for misbehave that I've seen before include "Conduct oneself badly" , "Act without propriety" , "Act badly" , "mess about" , "sin" .)