Happy union's no-score draw? (4,5)
I believe the answer is:
love match
'happy union's' is the definition.
'no-score draw?' is the wordplay.
'no score' becomes 'love' (I've seen this before).
'draw?' becomes 'match' (draw is a type of match).
'love'+'match'='LOVE-MATCH'
(Other definitions for love match that I've seen before include "romantic marriage" , "Sort of marriage" , "passionate union meeting" , "This is not just a convenient arrangement" , "Basis of successful partnership" .)