Music genre; diamond (4)

I believe the answer is:

rock

I believe this clue is a double definition.

'music genre' is the first definition.
(I know that rock is a type of popular music)

'diamond' is the second definition.
(thesaurus)

(Other definitions for rock that I've seen before include "Large stone - type of music" , "Reel from" , "Style of music; shock" , "Gently move; boulder" , "Edinburgh - -" .)

I've seen this clue in The Times.

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