Nothing titillating? Not quite (6)
I believe the answer is:
naught
'nothing' is the definition.
(synonyms)
'titillating? not quite' is the wordplay.
'titillating?' becomes 'naughty' (I've seen this before).
'not quite' means to remove the last letter.
'naughty' with its last letter removed is 'NAUGHT'.
(Other definitions for naught that I've seen before include "[NOT A WHIT]" , "Come to --; set at --" , "Old word for nothing, sounds like zero" , "bad" , "The figure O" .)