Just the chap to play it again? (3)

I believe the answer is:

sam

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'it again?' is the definition.
The definition suggests a singular noun which matches the answer.

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

Can you help me to learn more?

(Other definitions for sam that I've seen before include "Casablanca piano player" , "Uncle" , "together once" , "Boy" .)

I've seen this clue in the Evening Standard.

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