Audible evidence that the last of the Mohicans had sound knees (6)

I believe the answer is:

sneeze

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'audible evidence' is the definition.
'sneeze' can be an answer for 'evidence' (sneeze is a kind of evidence). I'm not certain of the 'audible' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sneeze that I've seen before include "Explosion of air through nose and mouth" , "Response to nasal irritation" , "Nasal eruption as caused by cold or dust" , "What might occasion a "Gesundheit"" , "Symptom of cold" .)

I've seen this clue in the Evening Standard.

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