It’s not cold in the attic (4)
I believe the answer is:
heat
'it's not cold' is the definition.
I can't tell whether this defines the answer.
'in the attic' is the wordplay.
'in' says the answer is hidden in the clue.
'HEAT' can be found hidden inside 'the attic'.
Can you help me to learn more?
(Other definitions for heat that I've seen before include "Energy that causes a rise in temperature" , "Raise temperature" , "Preliminary race to qualify finalists" , "It's measured in therms" , "Vehemence" .)