Answer: nightmare

AnswerCrossword Clue
NIGHTMARE

Incubus

NIGHTMARE

Frightening ordeal

NIGHTMARE

Bad dream

NIGHTMARE
Dread in the dark.
NIGHTMARE
Frightening experience.
NIGHTMAREBad dream.
NIGHTMAREWorry
NIGHTMAREPaul Revere's horse, maybe
NIGHTMAREConveyance to the party
NIGHTMARETraumatic experience on Elm Street
NIGHTMARETerrible ordeal? Give them a grin somehow (9)