Stake boat (4)
I believe the answer is:
punt
I believe this clue is a double definition.
'stake' is the first definition.
(punt can mean to stake in some card games)
'boat' is the second definition.
(I know that punt is a type of ferry)
(Other definitions for punt that I've seen before include "Riverboat" , "risky affair" , "Kick -- bet -- boat" , "Former currency of Ireland" , "taken by a better" .)