Crossword Genius

Revolutionary source for a cigar (7)

Ross

I believe the answer is:

cheroot

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

'revolutionary source' is the wordplay.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary**).
'source' becomes 'root' ('root' can be a synonym of 'source').
'che'+'root'='CHEROOT'

'for' is the link.

(Other definitions for cheroot that I've seen before include "With both ends cut off squarely, is smoked" , "Square-cut cigar" , "Variety of cigar" , "One smoked" , "Cigar with open ends - hot core (anag)" .)

I've seen this clue in The Times.
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