Unkindness in Norfolk town with ruler failing (10)
I believe the answer is:
disservice
'unkindness' is the definition.
(I've seen this before)
'norfolk town with ruler failing' is the wordplay.
'norfolk town' becomes 'diss' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'ruler' becomes 'er' (abbreviation for Elizabeth Regina).
'failing' becomes 'vice' (I've seen this in other clues).
'diss'+'er'+'vice'='DISSERVICE'
'in' is the link.
(Other definitions for disservice that I've seen before include "It's wrong" , "Harmful action" , "Unkindness" .)