Crossword Genius

One shows little authenticity in sound of instrument (4)

Ross

I believe the answer is:

liar

'one shows little authenticity' is the definition.
(someone inauthentic or dishonest)

'sound of instrument' is the wordplay.
'sound of' shows a homophone (sound like).
'instrument' becomes 'lyre' (lyre is a kind of instrument).
'lyre' is a homophone of 'LIAR'.

'in' acts as a link.

(Other definitions for liar that I've seen before include "Worse than a thief" , "Rail at a prevaricator" , "Pinocchio, at times" , "Perjuror" , "Person telling stories" .)

I've seen this clue in The Guardian.
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