Reduced potency, having consumed wine (8)
I believe the answer is:
muscatel
'wine' is the definition.
(muscatel is a kind of wine)
'reduced potency having consumed' is the wordplay.
I cannot really understand how this works, but
'consumed' could be 'ate' (eating is a kind of consuming) and 'ate' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for muscatel that I've seen before include "Sweet grape variety" , "Rich sweet wine" , "Flavoured wine made with calumets" , "Type of wine - calumets (anag)" , "Sweet aromatic grape used for raisins, wine" .)