Fellows curse clothing (8)
I believe the answer is:
menswear
'clothing' is the definition.
(I've seen this before)
'fellows curse' is the wordplay.
'fellows' becomes 'men' (fellow can mean a man).
'curse' becomes 'swear' (synonyms).
'men'+'swear'='MENSWEAR'
(Other definitions for menswear that I've seen before include "Male clothing" , "Sort of clothing" , "Gents' clothing" , "For example, ties" , "Suits, shirts, ties etc" .)