Low-down about right pain producing wine (8)
I believe the answer is:
grenache
'wine' is the definition.
(I've seen this before)
'low-down about right pain' is the wordplay.
'low down' becomes 'gen' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'pain' becomes 'ache' (ache is a kind of pain).
'gen' enclosing 'r' is 'gren'.
'gren'+'ache'='GRENACHE'
'producing' is the link.
(Other definitions for grenache that I've seen before include "grape for wine" , "Black grape variety" .)