Under-the-bed resident, in a child's imagination (7)

I believe the answer is:

monster

(Other definitions for monster that I've seen before include "Large, mytical creature" , "Ugly and frightening beast as in 8 Across" , "See 10" , "Large, ugly and frightening imaginary creature" , "Frightening creature of folklore" .)

I've seen this clue in The New York Times.

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