Can you make a pile playing it? (3)

I believe the answer is:

nap

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for nap that I've seen before include "Siesta" , "Raised surface of a fabric and short sleep" , "A short sleep or snooze" , "A short day-sleep" , "Pile of material" .)

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