Crossword Genius

Union that's not sound? (4)

Ross

I believe the answer is:

knot

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

'union' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'not sound?' is the wordplay.
'sound?' shows a homophone (sound like) (I've seen 'sound' mean this).
'not' is a homophone of 'KNOT'.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for knot that I've seen before include "Nautical mile, loosely" , "complex problem" , "Tie (or what is put in one?)" , "Nautical speed - group of toads" , "Measure of speed at sea" .)

I've seen this clue in the Evening Standard.
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