Crossword Genius

Of the regular rise and fall of the sea (5)

Ross

I believe the answer is:

tidal

(Other definitions for tidal that I've seen before include "__ wave; tsunami" , "Like waves" , "To do with movement of seas" , "Subject to moon's pull" , "Relating to the rise and fall of the sea" .)

I've seen this clue in The Times.
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