Crossword Genius

Possibly warm end to certain months (5)

Ross

I believe the answer is:

ember

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'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.

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(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" .)

I've seen this clue in the Evening Standard.
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