Crossword Genius

False witness to a rail crash (4)

Ross

I believe the answer is:

liar

'false witness' is the definition.
(thesaurus)

'a rail crash' is the wordplay.
'crash' indicates an anagram.
'rail' anagrammed gives 'LIAR'.

'to' acts as a link.

(Other definitions for liar that I've seen before include "Not a truth-sayer!" , "not straight [one]" , "One telling untruths" , "Teller of untruths" , "Dishonest person" .)

I've seen this clue in the Evening Standard.
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