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— wave (5)

Ross

There are a few possibilities for this:

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4

5

6 8 7*

'wave' is the definition.
(tidal wave is a kind of wave)

This is the entire clue.

(Other definitions for tidal that I've seen before include "Concerning lunar-driven ocean movements" , "What a bore may be" , "Subject to ebb and flow" , "Going back and forth" , "(Of the sea) ebbing and flowing" .)

I've seen this clue in The Telegraph, The New York Times, the Penny Press, the King Feature Syndicate, The Star Tribune, the Evening Standard and the Newsday.
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