It's said you will record fuel used in winter (4,3)
I believe the answer is:
yule log
'fuel used in winter' is the definition.
'yule log' can be an answer for 'fuel' (I have seen 'Seasonal fuel ' mean 'yule log' so perhaps 'fuel' could also mean 'yule log'). I am not certain of the 'used in winter' bit.
'it's said you will record' is the wordplay.
'it's said you will' becomes 'yule' (I can't explain this - if you can you should believe this answer much more).
'record' becomes 'log' (log is a kind of record).
'yule'+'log'='YULE-LOG'
Can you help me to learn more?
(Other definitions for yule log that I've seen before include "Seasonal Christmas cake" , "Christmas decoration" , "Christmas firewood" , "Basis of traditional fire at Christmas" , "Something eaten (or burned?) at Christmas" .)