Chunk of cash (3)
I believe the answer is:
wad
'chunk of cash' 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 "Lump or bundle of soft material" , "A bundle as of documents or banknotes" , "A thick bundle, maybe of money" , "Small mass of soft material" , "Pad of loose material used for packing" .)