Queen's land, once (5)
I believe the answer is:
sheba
'queen's land once' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sheba that I've seen before include "Hence Queen" , "Solomon was visited by this country's queen" , "Queen in the Bible unnamed except for her country; Balkis or Bilkis in the Quran" , "Ancient name of South Yemen" , "The Arrival of the Queen of - (Handel's Solomon)" .)