Crossword Genius

Hole in the head? (5)

Ross

I believe the answer is:

sinus

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hole in the head?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a cavity in the bones of the face)</span><br/ ><br/ >This is all the clue.<br/ ></span>

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

I've seen this clue in The Guardian.
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