Crossword Genius

Retains in the castles (5)

Ross

I believe the answer is:

keeps

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'retains' is the definition.
(keeping is a kind of retaining)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for keeps that I've seen before include "Retains" , "Stores" .)

I've seen this clue in the Sydney Morning Herald.
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