Fester (3)
'fester' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rankle that I've seen before include "get up your nose" , "Chafe" , "Go on irritating" , "Annoy continually" , "Cause continuing annoyance or resentment" .)
'fester' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for rot that I've seen before include "Balderdash" , "Gradual decline" , "Decompose; rubbish" , "Deteriorate" , "Decay, wither" .)