Crossword Genius

Scales not about to be seen in water at a beach (4)

Ross

I believe the answer is:

surf

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'a beach' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for surf that I've seen before include "White foam of breaking waves" , "Swell" , "Ride a wave" , "Ride the waves (or the Internet)" , "Waves breaking on the shore" .)

I've seen this clue in The Independent.
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