Itinerary revealed in case of resistance (5)
I believe the answer is:
route
'itinerary' is the definition.
(thesaurus)
'revealed in case of resistance' is the wordplay.
'revealed' becomes 'out' (I've seen this in other clues).
'in' indicates putting letters inside.
'case of' means to remove the middle letters (outsides of).
'resistance' with its middle taken out is 're'.
'out' put into 're' is 'ROUTE'.
(Other definitions for route that I've seen before include "The way to go" , "Way of getting from A to B" , "Way travelled" , "Course of journey" , "Course of 7" .)