Crossword Genius

Brainbox troubled by cracking ideas? (7)

Ross

I believe the answer is:

egghead

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

I don't understand how the remainder of the clue works.

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(Other definitions for egghead that I've seen before include "Heed gag about slang intellectual" , "Intellectual - highbrow" , "scholar" , "Cracked" , "Brainiac" .)

I've seen this clue in The Sun.
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