Composer in chamber gasping (4)

I believe the answer is:

berg

'composer' is the definition.
(20th Century Austrian composer)

'in chamber gasping' is the wordplay.
'in' indicates a hidden word.
'BERG' is hidden in the letters of 'chamber gasping'.

(Other definitions for berg that I've seen before include "Mountain (in German, South African)" , "Viennese composer" , "feature of icy waters" , "Alban ----, composer of the incomplete opera 'Lulu' (1935)" , "One who scored" .)

I've seen this clue in The Sun.

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