Discarded garden tools may be kept there (4)
I believe the answer is:
shed
'discarded' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for shed that I've seen before include "Small outbuilding" , "building away from home" , "warehouse" , "storage building" , "Garden feature" .)