Inclined to be mendacious (5)

I believe the answer is:

lying

I believe this clue is a double definition.

'inclined' is the first definition.

'mendacious' is the second definition.
('lying' can be a synonym of 'mendacious')

'to be' acts as a link.

(Other definitions for lying that I've seen before include "Fabrication" , "So one can't stand" , "Not being disturbed" , "Not straight" , "Flat-out" .)

I've seen this clue in The Times.

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