Crossword Genius

Then a grim disturbing incubus (9)

Ross

I believe the answer is:

nightmare

'incubus' is the definition.
(synonyms)

'then a grim disturbing' is the wordplay.
'disturbing' indicates an anagram.
'then'+'a'+'grim'='thenagrim'
'thenagrim' anagrammed gives 'NIGHTMARE'.

(Other definitions for nightmare that I've seen before include "Scary fantasy while asleep" , "He joins migrant in scary illusion" , "terrible experience" , "Frightening dream" , "Frightening nocturnal fantasy" .)

I've seen this clue in the Sydney Morning Herald.
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