Outer sort of course (5)
I believe the answer is:
route
'course' is the definition.
(I've seen this before)
'outer sort' is the wordplay.
'sort' indicates an anagram.
'outer' is an anagram of 'ROUTE'.
'of' acts as a link.
(Other definitions for route that I've seen before include "Course taken" , "The way to get somewhere" , "Send a particular way" , "Course followed" , "Way, course" .)