Crossword Genius

Rising and falling, ocean-like (5)

Ross

I believe the answer is:

tidal

(Other definitions for tidal that I've seen before include "Going back and forth" , "(Waters) subject to moon/sun" , "Like waves" , "Pertaining to rise and fall of the sea" , "(Of the sea) ebbing and flowing" .)

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