Cigar Eleanor occasionally holds up (6)
I believe the answer is:
corona
'cigar' is the definition.
(I have seen 'Long cigar' mean 'corona' so perhaps 'cigar' could also mean 'corona')
'eleanor occasionally holds up' is the wordplay.
'holds' says the answer is hidden in the clue.
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'anoroc' is hidden within 'eleanor occasionally'.
'anoroc' reversed gives 'CORONA'.
(Other definitions for corona that I've seen before include "Glow around the sun" , "Sun's envelope; cigar" , "Outer halo of the sun" , "shining circle" , "Long cigar" .)