Work outside home with fine alloy sheet (7)
I believe the answer is:
tinfoil
'alloy sheet' is the definition.
(sheet made of aluminium alloy)
'work outside home with fine' is the wordplay.
'work' becomes 'toil' (toil is a kind of work).
'outside' means one lot of letters goes inside another.
'home' becomes 'in' ('he's home' can mean 'he's in').
'with' is a charade indicator (letters next to each other).
'fine' becomes 'f' (abbreviation).
'in'+'f'='inf'
'toil' placed around 'inf' is 'TINFOIL'.
(Other definitions for tinfoil that I've seen before include "Thin metallic sheet" , "A help in the kitchen" , "Food wrapper" , "Thin metallic sheets for protecting food" , "Kitchen item" .)