Crossword Genius

Prone to be untruthful (5)

Ross

I believe the answer is:

lying

I believe this clue is a double definition.

'prone' is the first definition.
(thesaurus)

'untruthful' is the second definition.
('lying' can be similar in meaning to 'untruthful')

'to be' acts as a link.

(Other definitions for lying that I've seen before include "Spread out" , "Resting horizontally; fibbing" , "Anything but upright" , "telling stories" , "Saying what is 23" .)

I've seen this clue in the Evening Standard.
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