Red Muppet (4)
I believe the answer is:
elmo
'red muppet' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elmo that I've seen before include "St ----'s Fire: aura from electrical discharge" , "Saint whose "fire" occurs around masts etc" , "Sesame Street character - patron saint of sailors (with his own fire)" , "Puppet character" , "Fiery saint" .)