Does it need a plucky player? (4)

I believe the answer is:

harp

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'player?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for harp that I've seen before include "Heavenly instrument?" , "''The ... that once through Tara's halls'' (4)" , "Stringed instrument" , "Large plucked instrument" , "Keep on about" .)

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