Crossword Genius

Under-surface of an arch (6)

Ross

I believe the answer is:

soffit

(Other definitions for soffit that I've seen before include "underside of an architectural structure" , "'The underside of part of a building, arch say (6)'" , "Undersurface (of e.g. arch)" , "Underside of arch, stair, etc" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).
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