Ocean inappropriate for such a craft (5)
I believe the answer is:
canoe
'such a craft' is the definition.
(canoe is a kind of craft)
'ocean inappropriate' is the wordplay.
'inappropriate' indicates anagramming the letters (an improper or inaccurate order for the letters).
'ocean' anagrammed gives 'CANOE'.
'for' is the link.
(Other definitions for canoe that I've seen before include "Small boat with paddles" , "Boat one paddles" , "Kayak-like boat" , "Boat that's paddled" , "River craft" .)