Relating to the sea’s movement (5)

I believe the answer is:

tidal

(Other definitions for tidal that I've seen before include "Relating to the rise and fall of the sea" , "(Waters) subject to moon/sun" , "(Of the sea) ebbing and flowing" , "__ wave; tsunami" , "Concerning the rise and fall of the sea" .)

I've seen this clue in The Mirror.

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