Rustic claimant's version is not conclusive (14)

I believe the answer is:

circumstantial

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'not conclusive' is the definition.
'circumstantial' can be an answer for 'conclusive' (thesaurus). I'm not sure about the 'not' bit.

'rustic claimant's version' is the wordplay.
'version' is an anagram indicator.
'rustic'+'claimant'='rusticclaimant'
'rusticclaimant' with letters rearranged gives 'CIRCUMSTANTIAL'.

'is' is the link.

Can you help me to learn more?

(Another definition for circumstantial that I've seen is " (Of evidence) indirect".)

I've seen this clue in The Daily Express.

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