Beer containers (4)
'beer containers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for kegs that I've seen before include "Beer casks" , "Small barrels as for beer" , "Small casks or barrels" .)
(Other definitions for cans that I've seen before include "Metal containers" , "Tins" , "Headphones" .)