Pass the buck (4)
I believe the answer is:
punt
'pass the buck' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for punt that I've seen before include "Open flat-bottomed boat" , "Pre-euro currency unit of Ireland" , "Flat boat or familiar currency" , "gambling" , "Pre-euro unit of Irish currency" .)