Answer: NAGS

AnswerCrossword Clue
NAGSDerby competitors, slangily
NAGSUnlikely favorites
NAGSBothers persistently
NAGSTrack long shots
NAGSBothers
NAGSMaddens with reminders
NAGSUnlikely track winners
NAGSComplains continuously
NAGSMediocre mounts
NAGSAnnoys with constant complaints
NAGSBadgers or horses
NAGSNot exactly thoroughbreds
NAGSHarridans
NAGSTrack has-beens
NAGSWorn-out horses
NAGSConstantly reminds
NAGSCarps constantly
NAGSHaggard horses
NAGSHorses on their last legs
NAGSBack seat drivers, e.g.
nagsperson who nags
NAGSBothers and bothers and bothers
NAGSPreakness competitors, slangily
NAGSAlso rans
NAGSBeaten-down horses
NAGSCarps
NAGSGlue factory candidates
NAGSShrews
NAGSBettors bet on them
NAGSEmulates Xanthippe
NAGSWon't go away
NAGSActs the back-seat driver
NAGSActs shrewish
NAGSBadgers
NAGSFinds fault ad nauseam
NAGSHenpecks
NAGSIrritates
NAGSPesters
NAGSFaultfinders
NAGSOld horses