Crossword Genius

Supporter of the Reds on the same train as me? (6,9)

Ross

I believe the answer is:

fellow traveller

'supporter of the reds' is the definition.
(person sympathetic to communism)

I don't understand the rest of the clue.

(Other definitions for fellow traveller that I've seen before include "Like monk for nun in Chaucer, for example" , "like gypsy" , "left supporter" , "political ally" , "possibly 18 [PARTISAN]" .)

I've seen this clue in The Times.
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