Intellectual encouraged absorbing sources of history and art, separately (7)

I believe the answer is:

egghead

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'intellectual' is the definition.
(egghead is a kind of intellectual)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for egghead that I've seen before include "Heed gag about slang intellectual" , "Very academic person" , "Intellectual (colloq.)" , "may take a bashing at the breakfast table" , "brain" .)

I've seen this clue in The Times.

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