Decay (3)
'decay' is the definition.
(rot can mean to decay)
This is all the clue.
(Other definitions for rot that I've seen before include "Informal nonsense" , "'Decay, decompose (3)'" , "Garbage" , "Decay, perish" , "Decomposition" .)
'decay' is the definition.
(I know that blight is a type of desolation)
This is all the clue.
(Other definitions for blight that I've seen before include "Withering disease (in plants)" , "Fungal plant disease" , "Pestilence or disease, as of potatoes" , "Setback" , "Plant disease -- calamity" .)
'decay' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fester that I've seen before include "Decay" , "Ripen and generate pus" , "Rankle" , "Of wound, form yellow pus" , "Go septic or cause resentment" .)