River near Balmoral Castle (3)
I believe the answer is:
dee
'river near balmoral castle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dee that I've seen before include "Aberdeenshire river" , "Balmoral's river" , "John ---, Elizabethan mage" , "River at Chester" , "Aberdeen's river" .)