Bobbie who sang for uncommon people? (6)
I believe the answer is:
gentry
'people?' is the definition.
(upper-class people)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for gentry that I've seen before include "People, especially if posh" , "Upper-crust people, just below nobility" , "People of good breeding" , "people of a particular sort" , "People of good standing" .)