Rockers playing piece that's powerful (5)

I believe the answer is:

queen

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'rockers playing' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for queen that I've seen before include "Tom's partner" , "who collaborated musically with 14 [BOWIE]" , "Female cat" , "powerful man on board" , "Ruling lady" .)

I've seen this clue in The Telegraph.

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