Crossword Genius

Take the rest as pure fiction (3)

Ross

I believe the answer is:

lie

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'fiction' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

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(Other definitions for lie that I've seen before include "buried" , "Porky" , "Falsity" , "Piece of fiction" , "Disinformation" .)

I've seen this clue in the Evening Standard.
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