Quartet into beer and bubbly (5)
I believe the answer is:
alive
'bubbly' is the definition.
(I've seen this in another clue)
'quartet into beer' is the wordplay.
'quartet' becomes 'IV' (Roman numerals for four).
'into' is an insertion indicator.
'beer' becomes 'ale' (type of beer).
'iv' put within 'ale' is 'ALIVE'.
'and' is the link.
(Other definitions for alive that I've seen before include "Quick - breathing" , "In existence" , "Existent" , "Animated, on the ball" , "Aware" .)