Banqueter ignoring a brew (6)
I believe the answer is:
fester
'brew' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for fester that I've seen before include "Of wound, become septic and filled with pus" , "strange uncle" , "Become rotten, bitter or irritated" , "Decay" , "Putrefy" .)