Collection of cash (4-5)
I believe the answer is:
whip-round
'collection of cash' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for whip-round that I've seen before include "Quick collection of cash contributions" , "Collection of money as in office" , "An office collection as for someone retiring" , "Impromptu collection of money" , "Collection of money from members of group" .)