Crossword Genius

Chief curved structure (4)

Ross

I believe the answer is:

arch

I believe this is a double definition.

'chief' is the first definition.
(synonyms)

'curved structure' is the second definition.
(architectural structure)

(Other definitions for arch that I've seen before include "Curved aperture" , "Playfully superior" , "Chief - opening with curved top" , "Marble, for example" , "Curved overhead structure" .)

I've seen this clue in The Irish Independent.
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