Crossword Genius

Exchange prisoners from the East (4)

Ross

I believe the answer is:

swop

'exchange' is the definition.
(swopping is a kind of exchanging)

'prisoners from the east' is the wordplay.
'prisoners' becomes 'pows' (POW is an example).
'from the east' shows that the letters should be reversed in order.
'pows' back-to-front is 'SWOP'.

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

I've seen this clue in The Times.
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