A composer seen in rubber gloves (4)
I believe the answer is:
berg
'a composer' is the definition.
(20th Century Austrian composer)
'in rubber gloves' is the wordplay.
'in' says the answer is hidden in the clue.
'BERG' can be found hidden inside 'rubber gloves'.
'seen' is the 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)" .)