Sent back roast with fancy oil and Italian port (6)
I believe the answer is:
napoli
'italian port' is the definition.
(I've seen this in another clue)
'sent back roast with fancy oil' is the wordplay.
'sent back' says the letters should be written in reverse.
'roast' becomes 'pan' (panning roast is a kind of roasting).
'with' is a charade indicator (letters next to each other).
'fancy' is an anagram indicator.
'pan' in reverse letter order is 'nap'.
'oil' is an anagram of 'oli'.
'nap'+'oli'='NAPOLI'
'and' acts as a link.
(Other definitions for napoli that I've seen before include "Decline" , "Italian name for Naples" , "Mediterranean city" , "Italian city" .)