Wood remains in fireplace perhaps (3)
I believe the answer is:
ash
I believe this is a double definition.
'wood' is the first definition.
(I've seen this before)
'remains in fireplace perhaps' is the second definition.
(Other definitions for ash that I've seen before include "What's left of the fire" , "Grey colour" , "It's used for flooring" , "Woodland tree; result of burning" , "-- Wednesday" .)