Eccentric item that could be removed from deck (4)
I believe the answer is:
card
This clue is a double definition.
'eccentric' is the first definition.
(I've seen this before)
'item that could be removed from deck' is the second definition.
(Other definitions for card that I've seen before include "king or queen, for example" , "Stiff paper; plastic money" , "programme at race meeting" , "caution" , "Eccentric - stiff paper" .)