Moisten a roast (5)
I believe the answer is:
baste
'moisten a roast' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for baste that I've seen before include "Beast (anag.)" , "clobber" , "Looking at with interest" , "Keep moist" , "Moisten (joint)" .)