Gents' hairdresser (6)
I believe the answer is:
barber
'gents' hairdresser' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for barber that I've seen before include "Rossini opera 'The ...... of Seville'" , "who performs on the fringe?" , "One who cuts hair" , "Sweeney Todd's profession in Fleet Street" , "Hairdresser who also shaves beards" .)