Barriers Georgia set up (5)
I believe the answer is:
gates
'barriers' is the definition.
(gate is a kind of barrier)
'georgia set up' is the wordplay.
'georgia' becomes 'ga' (abbreviation).
'up' indicates an anagram (letters get chucked up).
'set' anagrammed gives 'tes'.
'ga'+'tes'='GATES'
(Other definitions for gates that I've seen before include "Entrances (for Bill?)" , "Billionaire Bill - openers" , "Rich American" , "Entrance (to Microsoft?)" , "Stage is set for them to open and close" .)