Crossword Genius

A toxic aim needs changing — that’s self-evident (9)

Ross

I believe the answer is:

axiomatic

'self-evident' is the definition.
(I've seen this before)

'a toxic aim needs changing' is the wordplay.
'needs changing' indicates an anagram (I've seen this in other clues).
'toxic'+'aim'='toxicaim'
'toxicaim' is an anagram of 'xiomatic'.
'a'+'xiomatic'='AXIOMATIC'

'that's' acts as a link.

(Other definitions for axiomatic that I've seen before include "Accepted" , "Given" , "Self-evidently true" , "Taken for granted" , "Pertaining to self-evident truths" .)

I've seen this clue in The Times.
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