Crossword Genius

Backtrack mendacious person? (4)

Ross

I believe the answer is:

liar

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'person?' is the definition.
(liar is a kind of person)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for liar that I've seen before include "Tale-teller" , "Teller of fibs" , "Not a truth-sayer!" , "Fibber" , "one trying to sell pork pies" .)

I've seen this clue in the Sydney Morning Herald.
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