___ to the brim (4)
I believe the answer is:
fill
'to the brim' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for fill that I've seen before include "Appoint person to (post)" , "Be suitable - . . . . the bill" , "Plug (a gap)" , "Satisfy (a need)" , "` `Work expands to .... the time available' '" .)