Drop it off at the building (4)
I believe the answer is:
shed
'the building' is the definition.
(shed is a kind of building)
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 "tools here, maybe?" , "made redundant" , "See 12" , "Threw off the hut" , "Hut - throw off - Guardian cryptic crossword setter" .)