Crossword Genius

Architectural highlight (5)

Ross

I believe the answer is:

oriel

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

This is the entire clue.

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(Other definitions for oriel that I've seen before include "corbelled window?" , "Projecting bay window -- Oxford college" , "Window built out from upper floor" , "Upper-story bay window" , "Upstairs bay window" .)

I've seen this clue in The Globe and Mail.
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