Fully satisfy it at sea, perhaps (7)
I believe the answer is:
satiate
'fully satisfy' is the definition.
(I've seen this before)
'it at sea perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'it'+'at'+'sea'='itatsea'
'itatsea' with letters rearranged gives 'SATIATE'.
(Other definitions for satiate that I've seen before include "Overstuff" , "Overfill - gorge" , "Have more than enough" , "Satisfy fully, cloy with excess" , "stuff" .)