Board-game piece, perhaps (4)
I believe the answer is:
tile
'board-game piece perhaps' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tile that I've seen before include "Thin rectangular slab to cover surfaces" , "Scrabble piece" , "Flat piece of ceramic" , "Flat thin slab of clay, for example" , "Roof slabs" .)