Crossword Genius

Affected by ebbing and flooding (5)

Ross

I believe the answer is:

tidal

(Other definitions for tidal that I've seen before include "Of ebbs and flows" , "Concerning regular changes in sea level" , "Concerning lunar-driven ocean movements" , "Going back and forth" , "To do with sea movements of lunar origin" .)

I've seen this clue in The Guardian.
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