Crossword Genius

Not solid (6)

Ross

I believe the answer is:

hollow

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

This is all the clue.

(Other definitions for hollow that I've seen before include "Empty in the middle" , "Empty; worthless" , "Cavity or space in something" , "Insincere; not solid" , "Empty space within" .)

I've seen this clue in the Evening Standard.
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