Crossword Genius

A showplace for swimmers (8)

Ross

I believe the answer is:

aquarium

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'a showplace' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for aquarium that I've seen before include "Tank for aquatic life" , "Large fish tank" , "Fish-viewing tank" , "A kind of fish zoo" , "Building containing fish tanks" .)

I've seen this clue in the Evening Standard.
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