The team to win about 40% of games? (5)
I believe the answer is:
wigan
'the team' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for wigan that I've seen before include "The Road to -- Pier (Orwell)" , "Manchester-area town, its Pier, Orwell" , "Greater Manchester town with an "Athletic" football club" , "North-western town" , "Lancashire FC" .)