Brainy picture playing champagne role (13)

I believe the answer is:

encephalogram

I'm a little stuck... Click here to teach me more about this clue!

'brainy picture' is the definition.
The definition suggests a singular noun which matches the answer.

'playing champagne role' is the wordplay.
'playing' is an anagram indicator.
'champagne'+'role'='champagnerole'
'champagnerole' is an anagram of 'ENCEPHALOGRAM'.

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I've seen this clue in The Daily Express.

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