Private, confidential (8)
I believe the answer is:
personal
I believe this clue is a double definition.
'private' is the first definition.
(associated in meaning)
'confidential' is the second definition.
(I've seen this before)
(Other definitions for personal that I've seen before include "Intimate - in the flesh" , "Individual; advert (column)" , "Private - (of remarks) offensive" , "Affecting an individual" , "Confidential" .)