Contest to set between leaders (4-2-4)
I believe the answer is:
head-to-head
'set between leaders' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'contest to' is the wordplay.
I cannot really see how this works, but
'to' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for head-to-head that I've seen before include "In direct competition" , "Confrontational conversation" .)