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One clever enough to be boss at the Oval? (7)

Ross

I believe the answer is:

egghead

I'm a little stuck... Click here to teach me more about this clue!

'one clever enough' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'boss at the oval?' is the wordplay.
'boss' becomes 'head' (synonyms).
'at' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the oval?' becomes 'egg' (I can't justify this - if you can you should give a lot more credence to this answer).
'head' put after 'egg' is 'EGGHEAD'.

'to be' is the link.

Can you help me to learn more?

(Other definitions for egghead that I've seen before include "Brainiac" , "Expert" , "Brainbox" , "Brainy type" , "Intellectual - highbrow" .)

I've seen this clue in the Evening Standard.
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