The sport of arguing (6)
I believe the answer is:
rowing
This clue is a double definition.
'the sport' is the first definition.
(rowing is a kind of sport)
'arguing' is the second definition.
(I've seen this before)
'of' is the link.
(Other definitions for rowing that I've seen before include "in dispute" , "Propelling boat with oars" , "Olympic sport; arguing" , "Sculling sport?" , "Olympic event" .)