Feed a furnace (5)
I believe the answer is:
stoke
'feed a furnace' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stoke that I've seen before include "Where pottery is made" , "city" , "Add more Yule logs to the fire?" , "keep the furnace going" , "Attend to fire" .)