Was drunk, though having been brewed for too long (6)
I believe the answer is:
stewed
'long' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for stewed that I've seen before include "Was long embarrassed" , "Of tea, infused too long" , "casseroled!" , "felt uneasy" , "mortal" .)