Work to insulate home with fine wrapping material (7)
I believe the answer is:
tinfoil
'wrapping material' is the definition.
(material which food is wrapped in)
'work to insulate home with fine' is the wordplay.
I cannot quite see how this works, but
'home' could be 'in' ('he's home' can mean 'he's in') and 'in' is located in the answer.
'fine' could be 'f' (abbreviation) and 'f' is found within the answer.
'work' could be 'toil' (toil is a kind of work) and 'toil' is located in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tinfoil that I've seen before include "A help in the kitchen" , "up to wrapping up dope" , "Metallic sheeting used for cooking" , "Rolled metal" , "Fine metal" .)