United in goalless game better (5)
I believe the answer is:
outdo
'better' is the definition.
(I've seen this before)
'united in goalless game' is the wordplay.
'united' becomes 'utd' (common abbreviation as in names of sports teams).
'in' means one lot of letters goes inside another.
'goalless game' becomes 'oo' (resembles 0-0 score).
'utd' placed into 'oo' is 'OUTDO'.
(Other definitions for outdo that I've seen before include "Br superior to (someone)" , "Perform better than another" , "Surpass someone at something" , "Beat" , "Perform better than, be superior to" .)