Crossword Genius

Waterproof shed? Very noble (9)

Ross

I believe the answer is:

imperious

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'waterproof shed? very noble' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

This is all the clue.

Can you help me to learn more?

(Other definitions for imperious that I've seen before include "Arrogant, domineering" , "Bossy" , "high-handed" , "Haughty - domineering" .)

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