Boffin (7)

I think it could be either:

Which length description are you looking for?:

egghead

'boffin' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for egghead that I've seen before include "Expert" , "Intellectual, studious academic" , "may take a bashing at the breakfast table" , "Very clever person" , "Brainy type" .)

I've seen this clue in The Times, The Telegraph and The Sun.

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