The French name for a boy unable to lie? (3)

I believe the answer is:

les

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'the french' is the definition.
(plural form of 'the' in French)

I don't understand how the rest of the clue works.

(Other definitions for les that I've seen before include "-- Dawson (late comedian)" , "Short boy or girl" , "- Dawson, Br. comedian" , "-- Dawson, English comic" , "Boy's name (abbr)" .)

I've seen this clue in the Evening Standard.

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