Worried by honest person standing for election (9)
I believe the answer is:
candidate
'person standing for election' is the definition.
(candidate for election)
'worried by honest' is the wordplay.
'worried' becomes 'ate' (something worrying may eat someone up).
'by' means one lot of letters go next to another.
'honest' becomes 'candid' (I've seen this in another clue).
'ate' after 'candid' is 'CANDIDATE'.
(Other definitions for candidate that I've seen before include "Person who seeks appointment to an office" , "Applicant, nominee 99)" , "Detain cad seeking appointment" , "Applicant; examinee" , "Campaigner" .)