Warm house and outbuilding very good inside (10)
I believe the answer is:
hospitable
'warm' is the definition.
(thesaurus)
'house and outbuilding very good inside' is the wordplay.
I cannot really understand how this works, but
'house' could be 'ho' (abbreviation for house) and 'ho' is present in the answer.
'good' could be 'pi' (I've seen this in other clues) and 'pi' is located in the answer.
'outbuilding' could be 'stable' and 'stable' is located in the leftover letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
(Other definitions for hospitable that I've seen before include "Warm" , "Helpful" , "Welcoming to guests" , "kind" , "Friendly, welcoming" .)