Rustic friend welcoming roast being served (8)
I believe the answer is:
pastoral
'rustic' is the definition.
('pastoral' can be a synonym of 'rustic')
'friend welcoming roast being served' is the wordplay.
'friend' becomes 'pal' (pal is a kind of friend**).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'being served' indicates anagramming the letters.
'roast' is an anagram of 'astor'.
'pal' placed around 'astor' is 'PASTORAL'.
(Other definitions for pastoral that I've seen before include "To do with shepherds, or concerned with spiritual guidance" , "Relating to personal care - in the countryside, perhaps" , "Bucolic, rural" , "of minister's duties" , "19's 6th 16" .)