Crossword Genius

Scales found in zany hotel? (8)

Ross

I believe the answer is:

prunella

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'hotel?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for prunella that I've seen before include "Scales maybe" , "It reputedly heals everyone" , "Strong silk" , "-- Scales, actress" , "flower" .)

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