Food in time at sea (4)
I believe the answer is:
eats
'food' is the definition.
(eats can mean food)
'in time at sea' is the wordplay.
'in' says the answer is hidden in the clue.
'EATS' is hidden within 'time at sea'.
(Other definitions for eats that I've seen before include "Common grub" , "Consumes or dines" , "Devours - food" , "corrodes" , "Munches" .)