Outer layer of an organ such as the brain (6)

I believe the answer is:

cortex

(Other definitions for cortex that I've seen before include "Outer layer of organ, such as the brain" , "Outer grey matter of the brain" , "Region of the brain" , "Outer layer of the front part of the brain" , "Cerebral - -" .)

I've seen this clue in The Times.

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