Clear-cut identification in case (7)
I believe the answer is:
evident
'clear-cut' is the definition.
(thesaurus)
'identification in case' is the wordplay.
'identification' becomes 'ID'.
'in' indicates putting letters inside.
'case' becomes 'event' (synonyms).
'id' inserted into 'event' is 'EVIDENT'.
(Other definitions for evident that I've seen before include "Obvious, may be plainly seen" , "Visible - plain" , "Conspicuous" , "Clearly discernible" , "Plain, obvious, clear" .)