Storage unit (6)
'storage unit' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cupboard that I've seen before include "Piece of furniture used for storage" , "Kitchen storage" , "One with shelves and door" , "Type of cabinet" , "Press" .)
(Other definitions for pod that I've seen before include "Group of whales" , "Natural container for pea" , "Seed case; whale herd" , "Pea shell" , "Elongated seed case" .)
(Other definitions for closet that I've seen before include "US press for clothing" , "Private room; cupboard" , "Shut away in private conference - in small room?" , "Compartment for clothing in the US" , "small compartment for clothing" .)