Kindle download (4)

I think it could be either:

Which length description are you looking for?:

book

'kindle download' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for book that I've seen before include "Hardback, say" , "Volume - maybe thrown at offender" , "Paperback" , "Strict rules" , "Reserve - bets taken on a race" .)

I've seen this clue in The Wall Street Journal.

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