Glowing cigar (6)
I believe the answer is:
corona
This clue is a double definition.
'glowing' is the first definition.
(corona is a kind of glowing)
'cigar' is the second definition.
(corona is a kind of cigar)
(Other definitions for corona that I've seen before include "Circle of light around sun or moon" , "Big Smoke" , "fiery halo" , "Part of the sun's atmosphere visible during a total eclipse" , "Ring round the sun or moon" .)