Specific (8)
(Other definitions for particular that I've seen before include "Specific" , "Respect" , "Exceptional" , "Fussy" , "certain" .)
'specific' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for concrete that I've seen before include "factual type of evidence?" , "Building material - tangible" , "Substantial, real" , "Not abstract or imaginary" , "Real; building material" .)
'specific' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for definite that I've seen before include "Clearly decided" , "Explicit, positive" , "Unmistakable" , "Known for certain" , "Certain; clearly stated" .)