Crusoe's disguised tracks (7)
I believe the answer is:
courses
'tracks' is the definition.
(I know this)
'crusoe's disguised' is the wordplay.
'disguised' indicates an anagram.
'crusoes' with letters rearranged gives 'COURSES'.
(Other definitions for courses that I've seen before include "Runs" , "Separate dishes in meal" , "starters, perhaps" , "Each of the successive parts of a meal" , "Series of lessons" .)