Discriminating fact (10)
I believe the answer is:
particular
I believe this clue is a double definition.
'discriminating' is the first definition.
(thesaurus)
'fact' is the second definition.
(I know that particular is a type of fact)
(Other definitions for particular that I've seen before include "Meticulous" , "Special" , "Specific" , "going into detail" , "Respect" .)