Concrete in there also (4)
I believe the answer is:
real
'concrete' is the definition.
(associated in meaning)
'in there also' is the wordplay.
'in' says the answer is hidden in the clue.
'REAL' is hidden within 'there also'.
(Other definitions for real that I've seen before include "Actual, not imagined" , "very American" , "Actual; Brazilian currency" , "Madrid FC; genuine" , "Substantial" .)