Crossword Genius

Head cavity (5)

Ross

I believe the answer is:

sinus

'head cavity' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sinus that I've seen before include "Hollow space" , "Air-filled cavity of the skull" , "Air-filled cavity in one's head" , "Space in temple" , "Cavity within a bone" .)

I've seen this clue in the Penny Press and The Telegraph.
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