Crossword Genius

Her little boy's a bit of a liar, it seems! (5)

Ross

I believe the answer is:

sonia

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'her' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sonia that I've seen before include "...O'Sullivan, great Irish athlete" , "Noa is really a girl" .)

I've seen this clue in the Evening Standard.
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