Grievance (6)
'grievance' is the definition.
(I know that grievance can be written as grudge)
This is all the clue.
(Other definitions for grudge that I've seen before include "Persistent feeling of resentment" , "Hard feelings" , "Envy, resent having to give" , "Feeling of enmity or envy" , "Feeling of resentment or illwill" .)
'grievance' is the definition.
(I have seen 'Legal grievance' mean 'plaint' so perhaps 'grievance' could also mean 'plaint')
This is all the clue.
(Other definitions for plaint that I've seen before include "Lamentation (poetic)" , "Dirge" , "Legal grievance" , "Legal suit" , "Lamentation or grievance" .)