Best supplied with ball on both United wings? (5)
I believe the answer is:
outdo
'best' is the definition.
(I know that best can be written as outdo)
'supplied with ball on both united wings?' is the wordplay.
I cannot really see how this works, but
'ball' could be 'o' (O looks like a ball) and 'o' is found in the answer.
'united' could be 'utd' (common abbreviation as in names of sports teams) and 'utd' is located in the answer.
A single letter 'o' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for outdo that I've seen before include "Surpass - overshadow - excel" , "Perform better than another" , "Surpass, go one better than" , "Perform better than (someone)" , "Overtake" .)