Competitions set to run with man well organised (11)
I believe the answer is:
Here is my best explanation:
'competitions' is the definition.
(tournament is a kind of competition)
'set to run with man well organised' is the wordplay.
'with' means one lot of letters go next to another.
'well organised' is an anagram indicator.
'settorunman' is an anagram of 'TOURNAMENTS'.
(Other definitions for tournaments that I've seen before include "Jousting events" and "competitive events".)