Pour fat over (5)
I believe the answer is:
baste
'pour fat over' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for baste that I've seen before include "Pour liquid over while cooking" , "Tack with long, loose stitches" , "Moisten (joint)" , "Moisten with liquid fat while roasting" , "Beast (anag.)" .)