The anterior portion of the brain of vertebrates, also called the telencephalon (8)

I believe the answer is:

cerebrum

(Other definitions for cerebrum that I've seen before include "Principal part of brain in front of skull" , "One thinks" , "Principle part of brain, in front of skull" , "not a whole loaf?" , "Main part of the brain" .)

I've seen this clue in The Independent.

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