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Alter egos in a Robert Louis Stevenson novel (6,3,4)

Ross

I think it could be either:

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13

6,3,4

jekyll and hyde

(Other definitions for jekyll and hyde that I've seen before include "showing dual nature" , "One person with two personalities" , "Person with dual personalities, one good, one evil" .)

I've seen this clue in The Times.
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