Crossword Genius

Hollow space (6)

Ross

I think it could be either:

recess

cavity

(Other definitions for recess that I've seen before include "Short break" , "Niche, alcove" , "secluded spot" , "When Parliament is not sitting" , "Alcove for remission of business" .)

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