Nasal aperture (7)

I believe the answer is:

nostril

'nasal aperture' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for nostril that I've seen before include "Nasal aperture" , "Breathing aperture" , "Nasal cavity" , "Through which one would snort" , "Nasal passageway" .)

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

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