St ...'s fire, weather phenomenon of coloured glow (4)

I believe the answer is:

elmo

(Other definitions for elmo that I've seen before include "Saint whose fire is electric!" , "Puppet character" , "Fiery saint" , "Saint whose "fire" occurs around masts etc" , "St ----'s Fire: aura from electrical discharge" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.