Crossword Genius

Nasal cavity (5)

Ross

I believe the answer is:

sinus

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

This is all the clue.

(Other definitions for sinus that I've seen before include "Air-filled cavity in one's head" , "Air cavity in the cranial bones" , "Cavity within a bone" , "Air-filled cavity of the skull" , "Cavity linked to nose" .)

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