Ocean-tossed boat (5)
I believe the answer is:
canoe
'boat' is the definition.
(canoeing is a kind of boating)
'ocean-tossed' is the wordplay.
'tossed' is an anagram indicator.
'ocean' is an anagram of 'CANOE'.
(Other definitions for canoe that I've seen before include "River craft" , "Boat one paddles" , "Narrow paddle boat" , "Light boat propelled with paddle" , "Hunting vessel originating in Haiti" .)