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