Red Muppet (4)
I believe the answer is:
elmo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">red muppet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)