Suave egghead from town (6)
I believe the answer is:
urbane
'suave' is the definition.
(I've seen this in another clue)
'egghead from town' is the wordplay.
I cannot quite see how this works, but
'egghead' could be 'e' (head letter of 'egg') and 'e' is present in the answer.
'town' could be 'urban' (urban means relating to a town or city) and 'urban' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for urbane that I've seen before include "Unbare, being suave." , "Cultured" , "Suave, refined, courteous" , "Cosmopolitan" , "Suave and sophisticated" .)