Worries about the new fares (5)
I believe the answer is:
fears
'worries' is the definition.
(I know this)
'the new fares' is the wordplay.
'the new' is an anagram indicator.
'fares' is an anagram of 'FEARS'.
'about' acts as a link.
(Other definitions for fears that I've seen before include "Is afraid of" , "Concerns, dreads" , "Apprehensions" .)