Definite remedy (8)
I believe the answer is:
specific
I believe this is a double definition.
'definite' is the first definition.
(thesaurus)
'remedy' is the second definition.
(thesaurus)
(Other definitions for specific that I've seen before include "Particular, special" , "Particular, distinct" , "Explicit or in detail" , "Well-defined" , "Clear and exact" .)