Follow men's fashion (6)
I believe the answer is:
tailor
'fashion' is the definition.
(tailoring is a kind of fashioning)
'follow men's' is the wordplay.
'follow' becomes 'tail' (both can mean to chase or pursue).
'men' becomes 'OR' (military abbreviation for Other Ranks).
'tail'+'or'='TAILOR'
(Other definitions for tailor that I've seen before include "One makes suits etc. to measure" , "person before soldier and sailor in list" , "Suit maker" , "Fit" , "Fashion" .)