In gale we rescue vessel (4)
I believe the answer is:
ewer
'vessel' is the definition.
(ewer is a kind of vessel)
'in gale we rescue' is the wordplay.
'in' indicates a hidden word.
'EWER' is hidden within 'gale we rescue'.
(Other definitions for ewer that I've seen before include "A wide-lipped jug" , "Large water-jug" , "Sort of jug" , "A wide-mouthed water jug" , "Were (anag)" .)