Storage structure
(Other definitions for shed that I've seen before include "Garden feature" , "Drop - cast off" , "Outbuilding with a single story" , "Slough - outbuilding" , "Drop; outhouse" .)
'storage structure' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for silo that I've seen before include "Farm tower" , "Grain storage tower" , "Tower for making fodder" , "Storage tower for oils" , "Tower used for storing fodder" .)