Crossword Genius

First of sea cadets around moated building in Kent (5,6)

Ross

I believe the answer is:

leeds castle

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'moated building in kent' is the definition.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for leeds castle that I've seen before include "Kent tourist attraction" , "Historic building near Maidstone" , "wrongly suggesting it's in Yorkshire?" , "British medieval palace" , "Keep" .)

I've seen this clue in The Guardian.
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