One with addled mind eventually? (7)

I believe the answer is:

egghead

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'one with addled mind eventually?' is the definition.
I can't judge whether this definition defines the answer.

'one with addled mind' is the wordplay.
'one with addled' becomes 'egg' (I can't explain this - if you can you should give a lot more credence to this answer).
'mind' becomes 'head' (synonyms).
'egg'+'head'='EGGHEAD'

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(Other definitions for egghead that I've seen before include "Ovoid-shaped intellectual" , "providing access to soldiers" , "Intellectual - highbrow" , "Intellectual (sl.)" , "Boffin" .)

I've seen this clue in The Sun.

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