Idiot turned up? Refuse to receive one contribution to thinking, perhaps (8)
I believe the answer is:
midbrain
'contribution to thinking perhaps' is the definition.
I can't tell whether this definition defines the answer.
'idiot turned up? refuse to receive one' is the wordplay.
'idiot' becomes 'dim' (both can mean stupid).
'turned up?' shows that the letters should be reversed in order.
'refuse' becomes 'bran' (I've seen this before).
'to receive' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'dim' written backwards gives 'mid'.
'bran' going around 'i' is 'brain'.
'mid'+'brain'='MIDBRAIN'
Can you help me to learn more?
(Another definition for midbrain that I've seen is " Some mind".)