Roll of bills (3)
I believe the answer is:
wad
'roll of bills' 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 bundle as of documents or banknotes" , "Bankroll; sandwich (slang)" , "Small bundle" , "Pad of loose material used for packing" , "A thick bundle, maybe of money" .)