Suspect fare changes (4)
I believe the answer is:
fear
'suspect' is the definition.
(thesaurus)
'fare changes' is the wordplay.
'changes' is an anagram indicator.
'fare' with letters rearranged gives 'FEAR'.
(Other definitions for fear that I've seen before include "Dread, great anxiety" , "awe" , "Fright" , "Qualms" , "Anxiety caused by danger" .)