A composer seen in rubber gloves (4)
I believe the answer is:
berg
'a composer' is the definition.
(Alban Berg, 1885 - 1935)
'in rubber gloves' is the wordplay.
'in' indicates the answer is hidden within the clue.
'BERG' is hidden within 'rubber gloves'.
'seen' acts as a link.
(Other definitions for berg that I've seen before include "One who scored" , "South African mountain - Austrian composer" , "Small version of ice mountain" , "He composed" , "Alban ----, composer of the incomplete opera 'Lulu' (1935)" .)