Judith Keppel announced her retirement from this quiz team last October (8)

I believe the answer is:

eggheads

(Other definitions for eggheads that I've seen before include "Quiz programme" , "Intellectuals with oval brains?" , "Intellectuals with ovoid craniums" , "academic talents" , "Slangy intellectuals with lofty domes" .)

I've seen this clue in The Times and The Sunday Times.

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