Crossword Genius

Cavity appears in useless bottles (5)

Ross

I believe the answer is:

sinus

'cavity' is the definition.
(sinus is a kind of cavity)

'appears in useless bottles' is the wordplay.
'bottles' says the answer is hidden in the clue (bottling is a kind of containing).
'SINUS' is hidden within 'appears in useless'.

(Other definitions for sinus that I've seen before include "Passage in the head" , "Hollow space" , "Cavity in skull connecting with nostrils" , "Space in temple" , "Hole in the head" .)

I've seen this clue in The Telegraph.
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