Possibly warm end to certain months (5)
I believe the answer is:
ember
'possibly warm end' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ember that I've seen before include "Material in dying fire" , "Piece of live coal" , "Still smouldering fragment of wood or coal" , "Glowing coal; prayer (Days)" , "Smouldering piece left over from a fire" .)