Crossword Genius

Real building material (8)

Ross

I believe the answer is:

concrete

I believe this clue is a double definition.

'real' is the first definition.
(similar in meaning)

'building material' is the second definition.
(concrete is a kind of building material)

(Other definitions for concrete that I've seen before include "Specific; definite" , "Unsightly building material" , "setter" , "It's composed of sand, cement and water" , "Building material is not abstract" .)

I've seen this clue in The Times and The Sun.
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