One who perjures or frees war criminal (10)

I believe the answer is:

forswearer

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'one who perjures' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'or frees war criminal' is the wordplay.
'criminal' indicates an anagram.
'or'+'frees'+'war'='orfreeswar'
'orfreeswar' anagrammed gives 'FORSWEARER'.

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