Crossword Genius

Domestic structures? (5)

Ross

I believe the answer is:

domes

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'structures?' is the definition.
(dome is a kind of structure)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for domes that I've seen before include "Cupolas" , "Hemispherical roofs" .)

I've seen this clue in the Evening Standard.
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