Musical groups in club and studio (5)
I believe the answer is:
bands
'musical groups' is the definition.
(band is a kind of musical group)
'in club and studio' is the wordplay.
'in' indicates the answer is hidden within the clue.
'BANDS' is hidden in the letters of 'club and studio'.
(Other definitions for bands that I've seen before include "Pop groups" , "Gangs" , "Groups playing popular music" , "Musical groups" .)