Crossword Genius

Not hollow (5)

Ross

I believe the answer is:

solid

'not hollow' is the definition.
('solid' is the opposite to 'hollow')

This is the entire clue.

(Other definitions for solid that I've seen before include "Firm - three-dimensional" , "Substantial - having three dimensions" , "Three-dimensional shape, not hollow" , "Reliable - substantial - pure" , "Reliable; not hollow" .)

I've seen this clue in the Evening Standard, the Newsday and The Telegraph.
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