Crossword Genius

Renovated castle, keeping area or moving staircase? (9)

Ross

I believe the answer is:

escalator

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'moving staircase?' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for escalator that I've seen before include "effortless steps" , "Carol eats (anag.)" , "nonstop flight" , "the easy way up" , "financial clause" .)

I've seen this clue in The Telegraph.
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