Answer:

nag

Answer	Crossword Clue
NAG	Harp
NAG	Worthless horse
NAG	Fuss at

NAG	Get on someone's case
NAG	Harry
NAG	Henpeck
NAG	Old horse or ex-wife
NAG	Pester
NAG	Remind and remind and remind
NAG	Annoy
NAG	Mount over the hill

NAG	Hound or horse
NAG	Horse that's had it
NAG	Rosinante
NAG	Complain and complain
NAG	Glue-factory candicate
NAG	Swaybacked sort
NAG	Kvetch
NAG	Worry or bother

NAG	Xanthippe
NAG	Gripe constantly
NAG	Gripe on and on
NAG	Carp at
NAG	No Derby winner
NAG	Plague
NAG	Old workhorse
NAG	Racehorse, slangily

NAG	What Walter Mitty's wife tends to do
NAG	Consistently pester
NAG	Walter Mitty's wife, e.g.
NAG	Constantly find fault
NAG	Badger
NAG	Badger or hound
NAG	Pick on
NAG	Faultfinder

NAG	Scraggly horse
NAG	Bother a lot
NAG	Find fault with, to a fault
NAG	Whiner
NAG	Nudge