Wild partying, try copying (5)
I believe the answer is:
aping
'copying' is the definition.
('ape' can be a synonym of 'copy')
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for aping that I've seen before include "Trying to repeat" , "Mimicking like monkey" , "Making copy of" , "Parroting" , "Acting like a parrot" .)