Well heated, for a hovel (6)
I believe the answer is:
toasty
'well heated' is the definition.
'for a hovel' is the wordplay.
'for' becomes 'to' (eg both can mean 'in the opinion of').
'hovel' becomes 'sty' (I've seen this in other clues).
'to'+'a'+'sty'='TOASTY'
(Other definitions for toasty that I've seen before include "Cosily warm" , "Hot food" , "snack" , "Pleasantly warm" , "Sandwich" .)