Farm buildings excluding poles (5)
I believe the answer is:
barns
'farm buildings' is the definition.
(barn is a kind of farm building)
'excluding poles' is the wordplay.
'excluding' becomes 'bar' (bar can mean excluding or except).
'poles' becomes 'ns' (North and South poles).
'bar'+'ns'='BARNS'
(Other definitions for barns that I've seen before include "Farm buildings" , "Agricultural outbuildings" , "Stables" , "Agricultural outbuilding" , "Sheds" .)