Crossword Genius

Instruct a claim must fail, given such evidence (14)

Ross

I believe the answer is:

circumstantial

'such evidence' is the definition.
(I've seen this before)

'instruct a claim must fail' is the wordplay.
'must fail' is an anagram indicator.
'instruct'+'a'+'claim'='instructaclaim'
'instructaclaim' is an anagram of 'CIRCUMSTANTIAL'.

'given' is the link.

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

I've seen this clue in The Guardian.
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