Black rock (6)

I believe the answer is:

reggae

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'black rock' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

This is the entire clue.

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(Other definitions for reggae that I've seen before include "West Indian music with strong subsidiary beat" , "Popular music of the West Indies" , "Type of West Indian music" , "Jamaican music style" , "W.I. music" .)

I've seen this clue in The Globe and Mail.

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