Crossword Genius

It dies at the end of three months (5)

Ross

I believe the answer is:

ember

I believe this is a double definition.

'it dies' is the first definition.
(the embers are the dying remains of a fire)

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

'at' is the link.

(Other definitions for ember that I've seen before include "what causes a warm glow" , "Burning coal" , "Still smouldering fragment of wood or coal" , "Just a glimmer" , "Wood still burning" .)

I've seen this clue in The Globe and Mail.
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