Crossword Genius

Clears up island engulfed by changing sea levels (6)

Ross

I believe the answer is:

tidies

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'clears up' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tidies that I've seen before include "Clears up" , "Makes neat and orderly" , "Puts things in order, neatens" .)

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