Building American shed for garden (3)
I believe the answer is:
hoe
'for garden' is the definition.
(to garden could mean to hoe)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for hoe that I've seen before include "Weed" , "Garden implement" , "Gardening tool" , "Purple gem" , "Garden tool with a flat blade" .)