Monster with a high-pitched voice (4)

I believe the answer is:

elmo

(Other definitions for elmo that I've seen before include "St ...'s fire, weather phenomenon of coloured glow" , "Saint associated with fire" , "Saint whose fire is electric!" , "Saint whose "fire" occurs around masts etc" , "Fiery saint" .)

I've seen this clue in The Washington Post.

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