Magic kingdom set back in mountain range (6)
I believe the answer is:
narnia
'magic kingdom set' is the definition.
I know nothing about this answer so I can't tell whether this works.
'back in mountain range' is the wordplay.
'back' shows that the letters should be reversed in order.
'in' says the answer is hidden in the clue.
'ainran' is hidden in the letters of 'mountain range'.
'ainran' reversed gives 'NARNIA'.
Can you help me to learn more?
(Other definitions for narnia that I've seen before include "C. S. Lewis's imaginary land" , "The Land of Lions, Witches and Wardrobes?" , "C. S. Lewis imaginary country" , "C.S. Lewis's imaginary land" , "C.S. Lewis's imaginary country" .)