Youngster to scour out some wine (9)
I believe the answer is:
lambrusco
'some wine' is the definition.
(I've seen this before)
'youngster to scour out' is the wordplay.
'youngster' becomes 'lamb' (a lamb is a young sheep).
'out' indicates an anagram (out can mean wrong or inaccurate).
'scour' is an anagram of 'rusco'.
'lamb'+'rusco'='LAMBRUSCO'
(Other definitions for lambrusco that I've seen before include "Sparkling Italian wine" , "Medium sweet, semi-sparkling Italian red or white wine" , "Type of Italian wine" .)