The way Utah breaks eggs? (5)
I believe the answer is:
'the way' is the definition.
(route is a kind of way)
'utah breaks eggs?' is the wordplay.
'utah' becomes 'UT' (abbreviation).
'breaks' means one lot of letters goes inside another (inserted letters break into the word).
'eggs?' becomes 'roe' (fish eggs).
'ut' going into 'roe' is 'ROUTE'.
(Other definitions for route that I've seen before include "Course, path" , "Course taken" , "track" , "Send a particular way" , "Course to destination" .)