A bunch of musicians have a couple of pints and get a bit wasted (7)
I believe the answer is:
quartet
'a bunch' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'musicians have a couple of pints and get a bit wasted' is the wordplay.
I cannot quite understand how this works, but
'a couple of pints' could be 'quart' (I've seen this before) and 'quart' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for quartet that I've seen before include "Group of four performers" , "Group of four musicians" , "A pair of braces" , "Four musicians playing together" , "Players" .)