Swindle model, friendly about being innate (10)
I believe the answer is:
congenital
'being innate' is the definition.
('congenital' can be a synonym of 'innate')
'swindle model friendly about' is the wordplay.
'swindle model' becomes 't' (I can't explain this - if you can you should believe this answer much more).
'friendly' becomes 'congenial' (similar in meaning).
'about' is an insertion indicator.
't' going within 'congenial' is 'CONGENITAL'.
Can you help me to learn more?
(Another definition for congenital that I've seen is " Absolute".)