Hollow space (6)

I think it could be either:

recess

cavity

'hollow space' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for cavity that I've seen before include "Hollow place" , "Hole, crater" , "Hole, gap" , "Empty space" , "Internal void" .)

I've seen this clue in the Newsday.com, The Mirror, The Guardian and The Times.

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