Crossword Genius

Diver's back-to-front converted stable area (4)

Ross

I believe the answer is:

smew

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'diver's' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for smew that I've seen before include "Sea duck" , "Bird" , "Small merganser" , "Diver" , "Species of merganser" .)

I've seen this clue in The Guardian.
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