Crossword Genius

Sound out a knotty point (5)

Ross

I believe the answer is:

nodus

I'm a little stuck... Click here to teach me more about this clue!

'a knotty point' is the definition.
The definition suggests a singular noun which matches the answer.

'sound out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'sound' with letters rearranged gives 'NODUS'.

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I've seen this clue in the Sydney Morning Herald.
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