A cone-shaped vessel (5)
I believe the answer is:
canoe
'vessel' is the definition.
(canoe is a kind of vessel)
'a cone-shaped' is the wordplay.
'shaped' is an anagram indicator.
'a'+'cone'='acone'
'acone' anagrammed gives 'CANOE'.
(Other definitions for canoe that I've seen before include "Boat one paddles" , "Hunting vessel originating in Haiti" , "Boat (that can be dug out!)" , "Light paddle-propelled boat" , "Light, narrow open boat" .)