Drink the last of the Rieslings with German gentleman getting tipsy at The Foundation (6)
I believe the answer is:
sherry
'drink' is the definition.
(sherry is a kind of drink)
'the last of the rieslings with german gentleman getting tipsy at the foundation' is the wordplay.
I cannot really understand how this works, but
'german' could be 'herr' and 'herr' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sherry that I've seen before include "Preprandial drink" , "Alcohol for the trifle" , "Strong sweet wine as aperitif" , "Alcoholic appetiser associated with Jerez" , "booze" .)