Literary alter ego (4)

I think it could be either:

Which length description are you looking for?:

2,4

hyde

'literary alter ego' is the definition.
(as in Dr Jekyll and Mr Hyde)

This is all the clue.

(Other definitions for hyde that I've seen before include "First president" , "doctor turned into during work" , "Green space in London" , "The evil personality (see 12)" , "... the latter side of [EVIL] nature" .)

I've seen this clue in The New York Times, the LA Times and the Newsday.

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