Crossword Genius

Steps indoors (9)

Ross

I believe the answer is:

staircase

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'steps' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for staircase that I've seen before include "Route between floors" , "Way between floors" , "Set of steps" , "part of the mansion?" , "It's Caesar (anag.)" .)

I've seen this clue in The Globe and Mail.
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