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