Crossword Genius

Well dressed but useless egghead (4)

Ross

I believe the answer is:

dude

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

'well dressed but useless egghead' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'useless egghead' is the wordplay.
'useless' becomes 'dud' (dud can mean faulty or failing).
'egghead' becomes 'e' (head letter of 'egg').
'dud'+'e'='DUDE'

Can you help me to learn more?

(Other definitions for dude that I've seen before include "An American dandy out west" , "Dandy - city dweller holidaying on ranch" , "Man (American slang)" , "Stylish and confidant man" , "He's no cowboy" .)

I've seen this clue in the Evening Standard.
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