Roll of banknotes (3)
I believe the answer is:
wad
'roll of banknotes' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for wad that I've seen before include "A thick bundle, maybe of money" , "Lump or bundle of soft material" , "Small bundle" , "Bundle of soft material or of banknotes" , "Bankroll; sandwich (slang)" .)