Minor disturbance often seen at the seaside? (7)

I believe the answer is:

wavelet

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'minor disturbance' is the definition.
The answer and definition can be both related to natural events as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

I don't understand how the rest of the clue works.

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I've seen this clue in The Independent.

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