Pieces in the game Rummikub (5)
I believe the answer is:
tiles
'pieces in the game rummikub' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tiles that I've seen before include "Thin flat slabs of fired clay" , "Small oblong slabs used in roofing" , "Thin flat slabs, for roofing perhaps" , "Roofing materials" , "Glazed rectangles used to cover walls or floors" .)