End lack of interest, ditching one new way of resolving ties (4,10)
I believe the answer is:
goal difference
'resolving ties' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'end lack of interest ditching one new way' is the wordplay.
I cannot really see how this works, but
'end' could be 'go' (going is a kind of ending) and 'go' is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'new' could be 'n' (common abbreviation eg NT for New Testament) and 'n' is present in the answer.
'way' could be 'e' (Compass direction - East) and 'e' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for goal difference that I've seen before include "Tie-break system" , "tiebreaker?" , "separates those for from those against" .)