Crossword Genius

After review Serb pays possible witness (6-2)

Ross

I believe the answer is:

passer-by

'possible witness' is the definition.
(a passer-by might have witnessed an event)

'after review serb pays' is the wordplay.
'after review' indicates an anagram (letters reviewed or revised).
'serb'+'pays'='serbpays'
'serbpays' anagrammed gives 'PASSER-BY'.

(Other definitions for passer-by that I've seen before include "One walking near" , "One happening past" , "Person walking past" , "Person who happens to be going past" , "Someone coming near" .)

I've seen this clue in The Times.
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