Answer: fiend

AnswerCrossword Clue
FIENDOld Nick
FIENDAddict
FIENDWhat? The Devil!
FIENDSatanic person
FIENDDevil
FIENDSatan
FIENDBeelzebub, e.g.
FIENDOgre
FIENDHellkite
FIENDBrute
FIENDHellhound
FIENDWicked person
FIENDArdent fan
FIENDArdent buff
FIENDBug of a kind
FIENDExpert at some activity: Colloq.
FIENDHellhound.
FIENDDemon.
FIENDHannibal Lecter, e.g.
fiendaddict
fiendevil spirit
fienda demon (an evil spirit)
fiendcruel person
FIENDSerious devotee
FIENDRabid enthusiast
FIENDRabid fan
FIENDInhuman one
FIENDMephistopheles.
FIENDDiabolic type
FIENDHorrible monster
FIENDDiabolic one
FIENDNasty type
FIENDReal enthusiast
FIENDOne who's devilishly devoted?
FIENDDevotee
FIENDEvil one
FIENDMr. Hyde, e.g.
FIENDWicked one
FIENDBuff
FIENDBig fan