Crossword Genius

Prone to deceive (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 the rest of the clue.

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(Other definitions for lying that I've seen before include "Anything but upright" , "Prone (to fabrications?)" , "Prone - telling porkies" , "Not being disturbed" , "dishonesty" .)

I've seen this clue in the Evening Standard.
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