Rough sea suppressing last bit of interest in food (4)
I believe the answer is:
eats
'food' is the definition.
(eats is a kind of food)
'rough sea suppressing last bit of interest' is the wordplay.
'rough' indicates anagramming the letters.
'suppressing' indicates putting letters inside.
'last bit of' suggests the final letters.
The final letter of 'interest' is 't'.
'sea' with letters rearranged gives 'eas'.
'eas' going around 't' is 'EATS'.
'in' acts as a link.
(Other definitions for eats that I've seen before include "Munches" , "Is not any faster" , "Takes food" , "Comestibles" , "snacks" .)