The way a tour is diverted to the East (5)
I believe the answer is:
route
'the way' is the definition.
(route is a kind of way)
'a tour is diverted to the east' is the wordplay.
'is diverted' is an anagram indicator (letters must be diverted to different positions).
'to the east' becomes 'e' (abbreviation).
'tour' is an anagram of 'rout'.
'rout'+'e'='ROUTE'
(Other definitions for route that I've seen before include "Way travelled" , "Established line of trave" , "Path taken" , "The way to get somewhere" , "Send a particular way" .)