Crossword Genius

Bound, say, to sea change (4)

Ross

I believe the answer is:

tide

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'sea change' is the definition.
The answer and definition can be both related to natural events as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'bound say' is the wordplay.
'bound' becomes 'tied' ('tie' can be a synonym of 'bind').
'say' indicates a 'sounds like' (homophone) clue.
'tied' sounds like 'TIDE'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for tide that I've seen before include "In the main, movement" , "Periodic water movement" , "Ebb and flow of the sea" , "Movement of seawater" , "One thing that waits for no man" .)

I've seen this clue in The Mirror.
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