Eccentric king, for example (4)
I believe the answer is:
card
I believe this is a double definition.
'eccentric' is the first definition.
(I've seen this in other clues)
'king for example' is the second definition.
(king is a type of playing card)
(Other definitions for card that I've seen before include "Bit of a wag - joker, perhaps" , "Jack, for one" , "eccentric character" , "appears in a suit" , "club perhaps" .)