Angry about a style of music (9)

I believe the answer is:

crossover

'a style of music' is the definition.

'angry about' is the wordplay.
'angry' becomes 'cross' (I've seen this before).
'about' becomes 'over' (I've seen this before).
'cross'+'over'='CROSSOVER'

(Other definitions for crossover that I've seen before include "Rock opera perhaps" , "Meeting point" , "Successfully combining two styles" , "combining distinct styles" , "in a mixture of styles" .)

I've seen this clue in The Guardian.

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