Crossword Genius

Flexible untruths told by chap with lisp (5)

Ross

I believe the answer is:

lithe

I'm a little stuck... Click here to teach me more about this clue!

'flexible' is the definition.
(I've seen this before)

'untruths told by chap with lisp' is the wordplay.
I cannot quite see how this works, but
'chap' could be 'he' and 'he' is present in the answer.
The remaining letters 'lit' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for lithe that I've seen before include "Able to move and bend gracefully" , "quick to move" , "Physically supple, agile" , "Don -, opera by Verdi" , "showing great athletic ability" .)

I've seen this clue in The Times and The Sunday Times.
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