Metal temperature at home (3)
I believe the answer is:
tin
'metal' is the definition.
(I know that tin is a type of metal)
'temperature at home' is the wordplay.
'temperature' becomes 't' (abbreviation).
'at' says to put letters next to each other.
'home' becomes 'in' ('he's home' can mean 'he's in').
't'+'in'='TIN'
(Other definitions for tin that I've seen before include "loaf of bread" , "A silvery-white metal often in cans" , "Canister" , "Element, symbol Sn" , "roofing material" .)