Sailor and rogue swapping sides at both ends (6)

I believe the answer is:

lascar

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'sailor' is the definition.
(I know that Lascar is a type of sailor)

I can't explain the rest of the clue.

(Other definitions for lascar that I've seen before include "The East Indian sailor is a rascal" , "Rascal (anag) - oriental seaman" , "Indiaman Jack" , "Kind of foreign sailor - quite a rascal" , "Asian sailor" .)

I've seen this clue in The Independent.

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