Crumple up (7)

I think it could be either:

Which length description are you looking for?:

wad

(Other definitions for wad that I've seen before include "Small mass of soft material" , "Bankroll; sandwich (slang)" , "Compact mass" , "Bundle of soft material or of banknotes" , "Lump or bundle of soft material" .)

I've seen this clue in The New York Times and the Penny Press.

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