Tidal wave (4)

I think it could be either:

Which length description are you looking for?:

tsunami

'tidal wave' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for tsunami that I've seen before include "Huge wave caused by earth tremor" , "Marine natural disaster" , "Destructive tidal wave" , "Strong surge" , "stormy sea" .)

I've seen this clue in the Sydney Morning Herald and the Evening Standard.

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