Row left editor embittered (7)
I believe the answer is:
rankled
'embittered' is the definition.
(thesaurus)
'row left editor' is the wordplay.
'row' becomes 'rank' (I've seen this before**).
'left' becomes 'l' (common abbreviation).
'editor' becomes 'ed'.
'rank'+'l'+'ed'='RANKLED'
(Other definitions for rankled that I've seen before include "resented" , "caused persistent annoyance" , "Festered" , "Embittered" , "caused constant annoyance" .)