Crossword Genius

Prone to deceit? (5)

Ross

I believe the answer is:

lying

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'prone' 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 lying that I've seen before include "Deceitful" , "Not being disturbed" , "So one can't stand" , "telling stories" , "Flat" .)

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