Meat course mostly stewed in wine (9)
I believe the answer is:
lambrusco
'wine' is the definition.
(I've seen this before)
'meat course mostly stewed' is the wordplay.
'meat' becomes 'lamb' (lamb is a kind of meat).
'mostly' means to remove the last letter.
'stewed' is an anagram indicator.
'course' with its final letter taken off is 'cours'.
'cours' is an anagram of 'rusco'.
'lamb'+'rusco'='LAMBRUSCO'
'in' acts as a link.
(Other definitions for lambrusco that I've seen before include "Type of Italian wine" , "Sparkling Italian wine" , "Medium sweet, semi-sparkling Italian red or white wine" .)