Crossword Genius

One's rehabilitated a defector to Labour? (2-3)

Ross

I believe the answer is:

ex-con

'one's rehabilitated' is the definition.
(someone rehabilitated in prison)

I don't understand the rest of the clue.

(Other definitions for ex-con that I've seen before include "Person once inside, now outside" , "Old lag" , "She used to serve porridge" , "One who has served time" , "One now free" .)

I've seen this clue in The Guardian.
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