Crossword Genius

Exchange of prisoners rejected (4)

Ross

I believe the answer is:

swop

'exchange' is the definition.
(swop is a kind of exchange)

'prisoners rejected' is the wordplay.
'prisoners' becomes 'pows' (POW is an example).
'rejected' says the letters should be written backwards.
'pows' reversed gives 'SWOP'.

'of' acts as a link.

(Another definition for swop that I've seen is " Exchange (Alt sp.)".)

I've seen this clue in The Guardian.
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