Thus act, so to speak, getting sweet wine (9)
I believe the answer is:
sauternes
'sweet wine' is the definition.
(I've seen this before)
'thus act so to speak' is the wordplay.
I cannot really understand how this works, but
'speak' could be 'uter' (I've seen this in another clue) and 'uter' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for sauternes that I've seen before include "A sweet Bordeaux" , "Sweet white wine" , "Sweet French wine" .)