Muppet host of "The Not-Too-Late Show" (4)
I believe the answer is:
elmo
(Other definitions for elmo that I've seen before include "St ----'s Fire: aura from electrical discharge" , "Saint associated with fire" , "Sesame Street character - patron saint of sailors (with his own fire)" , "Puppet character" , "Saint whose "fire" occurs around masts etc" .)