Crossword Genius

Imitation diamonds found on decapitated corpse (5)

Ross

I believe the answer is:

dummy

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'imitation' is the definition.
(thesaurus)

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

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(Other definitions for dummy that I've seen before include "Mannequin" , "Feign to pass" , "Make as if to pass" , "Visible hand of cards" , "Unreal substitute" .)

I've seen this clue in The Independent.
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