Smarter talk entertaining one (7)
I believe the answer is:
nattier
'smarter' is the definition.
(natty can mean smart or stylish)
'talk entertaining one' is the wordplay.
I cannot really see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
'talk' could be 'natter' (I have seen 'Casual talk' mean 'natter' so perhaps 'talk' could also mean 'natter') and 'natter' is found within the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for nattier that I've seen before include "Smarter and more fashionable" , "Like the smarter set" , "More clever" , "Louis XV court painter; more dapper" , "less scruffy" .)