Crossword Genius

Maintains parts of castles (5)

Ross

I believe the answer is:

keeps

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'maintains' is the definition.
('keep' can be a synonym of 'maintain')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Daily Express and The Mirror.
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