She'll tell you your future is entirely in your own hands (7)

I believe the answer is:

palmist

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But I can't explain it at all! Could you help me understand?

(Other definitions for palmist that I've seen before include "A practitioner of chiromancy" , "Person who tells fortunes from studying hands" , "Fortune reader" , "Fortune-teller" , "Person who tells fortunes from lines in hand" .)

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