Fills fully (5)
I believe the answer is:
sates
'fills fully' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sates that I've seen before include "Gluts or cloys with excess" , "Fills with food, stuffs" , "Fully satisfies" , "Satisfies -- asset (anag)" , "Stuffs or cloys with excess" .)