Where one boxer punches another to win! (2,3,4)
I believe the answer is:
on the nose
'win' is the definition.
(I've seen this before)
'where one boxer punches another' is the wordplay.
I cannot really see how this works, but
an anagram of 'one' is 'eno' which is present in the answer.
'another' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for on the nose that I've seen before include "where glasses rest" , "To win one" , "There's a bridge here" , "Exactly in America" , "where glasses are found?" .)