Southern German gentleman on the last of the elderberry wine (6)
I believe the answer is:
sherry
'wine' is the definition.
(sherry is a kind of wine)
'southern german gentleman on the last of the elderberry' is the wordplay.
'southern' becomes 's' (abbreviation).
'german gentleman' becomes 'herr' (I've seen this in another clue).
'on' is a charade indicator (letters next to each other).
'the last of' suggests the final letters.
The last letter of 'elderberry' is 'y'.
's'+'herr'+'y'='SHERRY'
(Other definitions for sherry that I've seen before include "Wine from the Jerez region of Spain" , "Jerez drink" , "Fortified wine from Jerez" , "Strong sweet wine as aperitif" , "Spanish fortified wine" .)