Perform with musical style (6)
I believe the answer is:
hairdo
'style' is the definition.
(I've seen this before)
'perform with musical' is the wordplay.
'perform' becomes 'do' (both can mean complete an action).
'with' is a charade indicator (letters next to each other).
'musical' becomes 'hair' (1960s musical).
'do' after 'hair' is 'HAIRDO'.
(Other definitions for hairdo that I've seen before include "Cut and set" , "Styling of the locks" , "Bob, perm or bouffant" , "Say, crew cut" , "Style of coiffure" .)