Carrier in a cafeteria (4)
I believe the answer is:
tray
'carrier in a cafeteria' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tray that I've seen before include "Item used for carrying food and drink" , "Flat surface for carrying things" , "'It's used for carrying, crockery say (4)'" , "Board for carrying items" , "Shallow receptable for carrying something" .)