Brainiacs (8)
I believe the answer is:
eggheads
'brainiacs' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eggheads that I've seen before include "Intellectuals with ovoid craniums" , "Slang intellectuals with lofty domes" , "academic talents" , "Intellectuals (colloq.)" , "Quiz programme" .)