Common finish is best after a drink (6,3)
I believe the answer is:
double top
'common finish' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'best after a drink' is the wordplay.
'best' becomes 'top' (top can mean the very best).
'after' is a charade indicator (letters next to each other).
'a drink' becomes 'double' (double shot of alcohol).
'top' put after 'double' is 'DOUBLE TOP'.
'is' is the link.
Can you help me to learn more?
(Other definitions for double top that I've seen before include "Score of 40 at darts" , "Thrower may need it for the game" , "A dart here scores 40" , "Forty with one dart" , "Dart player's preferred finish" .)