Try out some concrete structures (4)
I believe the answer is:
test
'try out' is the definition.
(I know that try out can be written as test)
'some concrete structures' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'TEST' is hidden in the letters of 'concrete structures'.
(Other definitions for test that I've seen before include "Try, examine critically" , "Ward off" , "Check" , "Dip one's toe in" , "type of examination" .)