Crossword Genius

What’s left after burning at end of three months? (5)

Ross

I believe the answer is:

ember

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'end of three months?' is the definition.
(September, November and December)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for ember that I've seen before include "Burning coal" , "Still smouldering fragment of wood or coal" , "Hot piece of wood or coal from a fire" , "Piece of live coal" , "Small piece of glowing coal in a dying fire" .)

I've seen this clue in The Times.
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