Hypnotist in 1895 George du Maurier novel Trilby (8)

I believe the answer is:

svengali

(Other definitions for svengali that I've seen before include "Sinister controller (of another person)" , "dominating influence" , "man of influence" , "Person exerting sinister control over another" , "Sinister manipulator" .)

I've seen this clue in The Mirror.

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