Hole (6)

I think it could be either:

Which length description are you looking for?:

cavity

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

This is all the clue.

(Other definitions for cavity that I've seen before include "Destination for a filling!" , "Hollow place" , "Hole, gap" , "A hole could mean work for the dentist" , "Hollow space" .)

I've seen this clue in The Mirror, The Independent and the Evening Standard.

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