A league match (5)
I believe the answer is:
union
I believe this clue is a double definition.
'a league' is the first definition.
(I've seen this before)
'match' is the second definition.
(I've seen this before)
(Other definitions for union that I've seen before include "Alliance of workers" , "Coupling, merger" , "Group who may want better conditions" , "Togetherness" , "Joining into one - association" .)