One more Away win (5)
I believe the answer is:
again
'one more' is the definition.
(thesaurus)
'away win' is the wordplay.
'away' becomes 'a' (abbreviation as used in sports fixtures).
'win' becomes 'gain' ('gain' can be a synonym of 'win'**).
'a'+'gain'='AGAIN'
(Other definitions for again that I've seen before include "Moreover - a second time" , "Predictably perhaps" , "return" , "second term" , "Next time" .)