Drops in to ask for some paper (5)

I believe the answer is:

quire

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'paper' is the definition.
(quantity of paper - 25 or 24 sheets)

I don't understand the remainder of the clue.

(Other definitions for quire that I've seen before include "One-twentieth of a ream" , "24 or 25 sheets of paper" , "1/20th of a ream" , "Measure of writing paper" , "Twentieth part of a ream" .)

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

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