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 an anagram (an improper or inaccurate order for the letters).
'ocean' anagrammed gives 'CANOE'.
'for' acts as a 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" .)