Backtrack and you'll find he's misled you (4)

I believe the answer is:

liar

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'backtrack and you'll find he's misled you' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

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(Other definitions for liar that I've seen before include "Rail at a prevaricator" , "Story teller?" , "Person regularly 'economical with the truth'" , "Fabricator" , "Pinocchio, at times" .)

I've seen this clue in the Evening Standard.

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