Get rid of garden facility (4)
I believe the answer is:
shed
This clue is a double definition.
'get rid' is the first definition.
(I've seen this before)
'garden facility' is the second definition.
'of' acts as a link.
(Other definitions for shed that I've seen before include "Barn" , "Cast, wooden building" , "Drop - cast off" , "lost" , "building away from home" .)