Wants to know how paper may be sold (8)

I believe the answer is:

inquires

'wants to know' is the definition.

'paper may be sold' is the wordplay.
I cannot quite understand how this works, but
'paper' could be 'quires' (quire refers to a large amount of paper) and 'quires' is found within the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'how' acts as a link.

(Another definition for inquires that I've seen is " Asks".)

I've seen this clue in The Guardian.

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