Boozy event with donkey trouble (7)
I believe the answer is:
wassail
'boozy event' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'with donkey trouble' is the wordplay.
'with' becomes 'w' (short for with).
'donkey' becomes 'ass' (ass is a term for a donkey).
'trouble' becomes 'ail' (synonyms).
'w'+'ass'+'ail'='WASSAIL'
Can you help me to learn more?
(Other definitions for wassail that I've seen before include "Drinking festivity" , "One that may come in to bowl" , "Revelry" , "Mulled wine" , "festive drink" .)