Crossword Genius

Cavity, opening (4)

Ross

I believe the answer is:

hole

I believe this clue is a double definition.

'cavity' is the first definition.
(hole is a kind of cavity)

'opening' is the second definition.
(I know that hole is a type of opening)

(Other definitions for hole that I've seen before include "Nasty place" , "Hollow, cavity" , "excavation" , "depression" , "pocket" .)

I've seen this clue in The Sun.
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