Fuel gives smoke and a rising measure of warmth (6)
I believe the answer is:
faggot
'fuel' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'smoke and a rising measure of warmth' is the wordplay.
'smoke' becomes 'fag' (both can mean a cigarette).
'and' is a charade indicator (letters next to each other).
'a rising' says the letters should be written in reverse (in a down clue, letters go up).
'measure of warmth' becomes 'tog' (I've seen this before).
'tog' in reverse letter order is 'got'.
'fag'+'got'='FAGGOT'
'gives' acts as a link.
Can you help me to learn more?
(Other definitions for faggot that I've seen before include "A ball of seasoned liver" , "lighter" , "Chopped liver dish" , "iron bars" , "Bundle of twigs used for fuel" .)