Crossword Genius

Lie detector (9)

Ross

I believe the answer is:

polygraph

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

This is the entire clue.

(Other definitions for polygraph that I've seen before include "Shower of pork pies" , "Lie-detector machine" , "Machine used as lie detector" , "Electronic instrument used as a lie detector" .)

I've seen this clue in The Mirror and the Sydney Morning Herald.
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