Garment, female, associated with popular music (5)
I believe the answer is:
frock
'garment' is the definition.
(I know that frock is a type of garment)
'female associated with popular music' is the wordplay.
'female' becomes 'f' (common abbreviation).
'associated with' is a charade indicator (letters next to each other).
'popular music' becomes 'rock' (genre of music).
'f'+'rock'='FROCK'
(Other definitions for frock that I've seen before include "Long gown worn by priests; woman's dress" , "Demon" , "Party dress?" , "something to put on" .)