Very silly taking degree in illogical language (9)
I believe the answer is:
idiomatic
'very silly taking degree in illogical language' is the definition.
I can't tell whether this definition defines the answer.
'very silly taking degree' is the wordplay.
'very silly' becomes 'idiotic' (I've seen this before).
'taking' means one lot of letters goes inside another.
'degree' becomes 'MA' (Master of Arts is a type of degree).
'idiotic' going around 'ma' is 'IDIOMATIC'.
Can you help me to learn more?
(Other definitions for idiomatic that I've seen before include "Using common language" , "using dialect" , "Using a particular mode of expression" , "Using characteristic speech" , "manner of speaking" .)