Eccentric message (4)
I believe the answer is:
card
I believe this clue is a double definition.
'eccentric' is the first definition.
(card can mean an eccentric person)
'message' is the second definition.
(I know that card is a type of correspondence)
(Other definitions for card that I've seen before include "Something players try to avoid" , "appears in a suit" , "Something (usually) folded with a special message" , "Jack, for one" , "eccentric character" .)