Crossword Genius

Fake doctor sectioned son unseen (6)

Ross

I believe the answer is:

deceit

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'fake' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for deceit that I've seen before include "Guile" , "Act of deliberate misleading" , "Fraud, falseness" , "Hypocrisy" , "Dishonesty, misrepresentation" .)

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