What’s left after burning at end of three months? (5)
I believe the answer is:
ember
'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" .)