Theoretical point you uttered? Keep secret about it (10)
I believe the answer is:
conceptual
'theoretical' is the definition.
(thesaurus)
'point you uttered? keep secret about it' is the wordplay.
'point' becomes 'pt' (abbreviation for point).
'you' becomes 'u' (commonly used in online communication).
'uttered? keep secret' becomes 'conceal' (I can't explain this - if you can you should believe this answer much more).
'about it' indicates putting letters inside.
'pt'+'u'='ptu'
'ptu' inserted inside 'conceal' is 'CONCEPTUAL'.
Can you help me to learn more?
(Another definition for conceptual that I've seen is " Relating to abstract ideas".)