Lost in the outhouse (4)
I believe the answer is:
shed
This clue is a double definition.
'lost' is the first definition.
(I've seen this before)
'outhouse' is the second definition.
(I've seen this before)
'in the' acts as a link.
(Other definitions for shed that I've seen before include "Remove clothes in small hut" , "Throw off; building" , "Garden feature" , "In which lawnmower is kept" , "something at the bottom of the garden?" .)