Someone likely to be a Hooray Henry's wife or girlfriend (6,6)
I believe the answer is:
sloane ranger
(Other definitions for sloane ranger that I've seen before include "Fashionable young woman of the upper classes (informal)" , "London socialite" , "Trendy young Chelsea resident?" , "Fashionable upper-class young Londoner" , "Lager near son (anag.)" .)