Composer seen in November gathering (4)
I believe the answer is:
berg
'composer' is the definition.
(20th Century Austrian composer)
'in november gathering' is the wordplay.
'in' says the answer is hidden in the clue.
'BERG' is hidden in the letters of 'november gathering'.
'seen' is the link.
(Other definitions for berg that I've seen before include "Small version of ice mountain" , "Viennese composer" , "Alban ----, composer of the incomplete opera 'Lulu' (1935)" , "He composed" , "South African hill - Austrian composer" .)