__-concrete (5)

I think it could be either:

Which length description are you looking for?:

practical

'concrete' is the definition.
(associated in meaning)

This is all the clue.

(Other definitions for practical that I've seen before include "type of joker" , "Functional, pragmatic" , "Concerned with doing rather than with theory" , "Workable, feasible" , "sort of joke?" .)

I've seen this clue in The Guardian.

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