Large amount of cash (3)
I believe the answer is:
wad
'large amount of cash' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for wad that I've seen before include "Bundle of soft material or of banknotes" , "Lump or bundle of soft material" , "Small mass of soft material" , "A thick bundle, maybe of money" , "Pad of loose material used for packing" .)