Answer: louse

AnswerCrossword Clue
LOUSESubject of a Burns poem
LOUSEUnsavory character
LOUSEFink
LOUSENo-good sort
LOUSEReal heel
LOUSEScrew (up)
LOUSEA real heel
LOUSE"To a ...", Burns poem
LOUSE"To a ...," Burns poem
LOUSEIt might make you a nit-picker
LOUSEFollower of book or wood
LOUSE" . . . scarce the soul of a ...": Kipling
LOUSELow-down character
LOUSE... up (botch)
LOUSEHeel
LOUSEDespicable one
LOUSENo-good one
LOUSENo-good heel
LOUSECrumbum
lousebloodsucking insect
lousecontemptible person
louseto spoil or bungle / a parasitic insect
LOUSEContemptible sort
LOUSETarget of permethrin cream
LOUSERat
LOUSEAphid
LOUSEIt could make you a nit picker
LOUSESlang for spoil, with "up."
LOUSENit
LOUSECommon parasite
LOUSEReason to nitpick?
LOUSEAdult nit
LOUSEWingless, bloodsucking insect
LOUSEIt might make you a nitpicker
LOUSEWingless insect
LOUSESkunk
LOUSENit layer
LOUSEContemptible person
LOUSEDirty rat
LOUSEReal stinker