Crossword Genius

Concrete is child's play to mix, vacuous lad conceded (8)

Ross

I believe the answer is:

physical

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'concrete' is the definition.
(thesaurus)

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(Other definitions for physical that I've seen before include "hard work" , "of concrete structure" , "Having a material existence" , "Involving bodily contact" , "Bodily - material" .)

I've seen this clue in The Independent.
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