Where tools may be kept or discarded (4)
I believe the answer is:
shed
'discarded' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for shed that I've seen before include "Cast - shine" , "Jettison" , "something at the bottom of the garden?" , "Hut - throw off - Guardian cryptic crossword setter" , "storage building" .)