Like tree in plot outside agricultural establishment (8)
I believe the answer is:
branched
'like tree' is the definition.
(trees have branches)
'plot outside agricultural establishment' is the wordplay.
'plot' becomes 'bed' (a plot of land).
'outside' is an insertion indicator.
'agricultural establishment' becomes 'ranch' (I've seen this before).
'bed' enclosing 'ranch' is 'BRANCHED'.
'in' acts as a link.
(Other definitions for branched that I've seen before include "Ramified" , "Forked, divided" .)