Bit of decoration on a cigar (6)

I believe the answer is:

corona

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'cigar' is the definition.
(corona is a kind of cigar)

'bit of decoration on a' is the wordplay.
'bit of decoration' becomes 'cor' (I am not sure about this - if you are sure you should believe this answer much more).
'cor'+'on'+'a'='CORONA'

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(Other definitions for corona that I've seen before include "Trumpet" , "Sun's gaseous envelope" , "Ring around the sun" , "Gaseous envelope of sun" , "Sun's envelope; cigar" .)

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