Related Clues:

• Item of underwear in mind
• What you think with
• It's in your skull
• It's working, I think!
• Scarecrow's wish, in Oz
• Really smart person
• Detectives reported on my little grey cells, perhaps
• Fabulous bird upset by most of the phone message - the brainy bit in particular
• MB's East ____ tree
• Scarecrow's desire in 'The Wizard of Oz'
• Part of brain forgetting conclusions from key piece of writing
• Shrewdness of British government, we hear
• Hard drive, essentially
• You have a motor one
• Scarecrow’s desire