Little boat in ocean smashed (5)
I believe the answer is:
canoe
'little boat' is the definition.
'canoe' can be an answer for 'boat' (canoeing is a kind of boating). I'm unsure of the 'little' bit.
'ocean smashed' is the wordplay.
'smashed' indicates an anagram.
'ocean' anagrammed gives 'CANOE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for canoe that I've seen before include "Hunting vessel originating in Haiti" , "River craft" , "Small boat with paddles" , "Light boat propelled with paddle" , "A dugout" .)