Graduate’s silly to go round speaking like a native (9)
I believe the answer is:
idiomatic
'native' is the definition.
(idiomatic describes native use of language)
'graduate's silly to go round' is the wordplay.
'graduate' becomes 'MA' (abbreviation for Master of Arts).
'silly' becomes 'idiotic' (I've seen this before).
'to go round' is an insertion indicator.
'ma' inserted within 'idiotic' is 'IDIOMATIC'.
'speaking like a' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for idiomatic that I've seen before include "Certain phrases may be" , "Using characteristic speech" , "Colloquial" , "Using common language" , "manner of speaking" .)