Separation; cleavage (9)
I believe the answer is:
severance
I believe this clue is a double definition.
'separation' is the first definition.
(I know that severance is a type of separation)
'cleavage' is the second definition.
(thesaurus)
(Other definitions for severance that I've seen before include "Dismissal from employment" , "Detachment" , "split" .)