Crossword Genius

Body cavity (5)

Ross

I believe the answer is:

sinus

'body cavity' is the definition.
(sinus is a kind of body cavity)

This is all the clue.

(Other definitions for sinus that I've seen before include "Cavity linked to nose" , "Air cavity in the cranial bones" , "Bodily cavity" , "Head space" , "Cavity in the facial bones" .)

I've seen this clue in the New York Times, the Evening Standard, The Independent and the Canadiana.
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