Ballet one to promote in Georgia (7)
I believe the answer is:
giselle
'ballet' is the definition.
(ballet by Adolphe Adam)
'one to promote in georgia' is the wordplay.
'one' becomes 'i' (Roman numeral).
'to promote' becomes 'sell' (sell can mean to promote or advertise).
'in' is an insertion indicator.
'georgia' becomes 'ge' (abbreviation for the European country).
'i'+'sell'='isell'
'isell' going into 'ge' is 'GISELLE'.
(Other definitions for giselle that I've seen before include "Romantic ballet" , "Female" , "Ballet with music by Adam" .)