Where tools may be discarded? (4)
I believe the answer is:
shed
'be discarded?' is the definition.
(I've seen this in other clues)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for shed that I've seen before include "In which tools may be" , "In which lawnmower is kept" , "Discarded" , "Separate" , "Drop; outhouse" .)