It sets out a devious popish plot he falsely claimed (5,5)

I believe the answer is:

titus oates

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'popish plot he falsely claimed' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'it sets out a devious' is the wordplay.
'devious' indicates anagramming the letters.
'it'+'sets'+'out'+'a'='itsetsouta'
'itsetsouta' with letters rearranged gives 'TITUS OATES'.

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I've seen this clue in The Irish Times.

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