Construction of planks and beams etc abandoned (4)
I believe the answer is:
shed
I believe this clue is a double definition.
'construction of planks and beams etc' is the first definition.
(a shed is a wooden structure)
'abandoned' is the second definition.
(shed can mean to abandon or cast off)
(Other definitions for shed that I've seen before include "Outbuilding with a single story" , "Threw off the hut" , "Discarded" , "Outbuilding for storage" , "See 12" .)