Three-dimensional (5)

I think it could be either:

Which length description are you looking for?:

solid

'three-dimensional' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for solid that I've seen before include "Firm - substantial" , "Idols (anag.)" , "Firmly constructed" , "Strongly made or built" , "Rock-hard" .)

I've seen this clue in The Times, the Newsday, the LA Times and the Penny Press.

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