Piece of music has magnificent opening (5)

I believe the answer is:

chasm

'opening' is the definition.
(I know that chasm is a type of opening)

'piece of music has magnificent' is the wordplay.
'piece of' indicates a hidden word.
'CHASM' is hidden in the letters of 'music has magnificent'.

(Other definitions for chasm that I've seen before include "Great divide" , "Deep hole" , "Wide gap" , "rent" , "One yawns" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app