Kinky porn sale, in private (8)
I believe the answer is:
personal
'private' is the definition.
(associated in meaning)
'kinky porn sale' is the wordplay.
'kinky' is an anagram indicator.
'porn'+'sale'='pornsale'
'pornsale' is an anagram of 'PERSONAL'.
'in' acts as a link.
(Other definitions for personal that I've seen before include "Private - bodily" , "Of one individual" , "Intimate - in the flesh" , "Affecting an individual" , "Individual; advert (column)" .)