Southern wine, listener heard, makes pig tender (9)
I believe the answer is:
swineherd
'pig tender' is the definition.
(I've seen this before)
'southern wine listener' is the wordplay.
'southern' becomes 's' (abbreviation).
'listener' becomes 'herd' (I can't justify this - if you can you should believe this answer much more).
's'+'wine'+'herd'='SWINEHERD'
'heard makes' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for swineherd that I've seen before include "Tender of pigs" , "A minder of pigs" , "Farmhand" , "Pig tender" , "I work on farm" .)