Queen's attendant (4-2-7)
I believe the answer is:
lady-in-waiting
'queen's attendant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lady-in-waiting that I've seen before include "Queen's personal attendant" , "Female attendant in a royal household" , "Female attending royalty" , "Female attendant for a queen" .)