Group extremely exuberant after a couple of pints (7)
I believe the answer is:
quartet
'group' is the definition.
(quartet is a kind of group)
'extremely exuberant after a couple of pints' is the wordplay.
'extremely' says to hollow out the word (remove centre letters).
'after' says to put letters next to each other.
'a couple of pints' becomes 'quart' (I've seen this before).
'exuberant' with its centre taken out is 'et'.
'et' put after 'quart' is 'QUARTET'.
(Other definitions for quartet that I've seen before include "Players" , "Set of four people" , "[COMPOSITION]" , "Four musicians playing together" , "Group of four performers" .)