Scoreless draw has United getting better (5)
I believe the answer is:
outdo
'better' is the definition.
(to outdo is to beat or do better than)
'scoreless draw has united' is the wordplay.
'scoreless draw' becomes 'oo' (I can't explain this - if you can you should believe this answer much more).
'has' is an insertion indicator.
'united' becomes 'utd' (common abbreviation as in names of sports teams).
'oo' enclosing 'utd' is 'OUTDO'.
'getting' is the link.
Can you help me to learn more?
(Other definitions for outdo that I've seen before include "going to top?" , "Overcome" , "Surpass - overshadow - excel" , "Go one beter than, surpass" , "Surpass, go one better than" .)