Temporary shelter (4-2)
I believe the answer is:
lean-to
'temporary shelter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lean-to that I've seen before include "Building added to another" , "Building propped against the wall of another" , "Shed, outbuilding" , "On late (anag)" , "Building built against another" .)