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Bound, we hear, to change in sea level (4)

Ross

I believe the answer is:

tide

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

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

'to' is the link.

Can you help me to learn more?

(Other definitions for tide that I've seen before include "Ocean movement" , "Powerful surge" , "Periodic flow" , "Periodic water movement" , "Periodic rise and fall of the sea" .)

I've seen this clue in The Daily Express.
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