Nothing that's right can be more titillating (9)
I believe the answer is:
naughtier
'more titillating' is the definition.
Both the definition and answer are comparative adjectives. Perhaps there's an association between them I don't understand?
'nothing that's right' is the wordplay.
'nothing' becomes 'naught' (synonyms).
'that's' becomes 'ie' (abbreviation for 'id est', 'that is' in Latin).
'right' becomes 'r' (common abbreviation).
'naught'+'ie'+'r'='NAUGHTIER'
'can be' acts as a link.
Can you help me to learn more?
(Other definitions for naughtier that I've seen before include "Less well behaved" , "Worse" , "More mischievous" , "More badly behaved" , "more unruly" .)