Film character who becomes trapped in a dentist's office (4)

I believe the answer is:

nemo

(Other definitions for nemo that I've seen before include "- me impune lacessit (motto of Scotland)" , "Captain brought to book" , "Captain of the Nautilus" , "commander for the Nautilus" , "Fish sought in film" .)

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

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