Some returned from enchanted mountain (4)
I believe the answer is:
etna
'mountain' is the definition.
(Etna is an example)
'some returned from enchanted' is the wordplay.
'some returned' says the letters should be written in reverse.
'from' says the answer is hidden in the clue.
'ante' is hidden in the letters of 'enchanted'.
'ante' back-to-front is 'ETNA'.
(Other definitions for etna that I've seen before include "a mount hotly tipped when it runs" , "Volcano; reverse of stake" , "smoker in Sicily" , "Highest peak in Italy south of the Alps" , "Mount . . . . is a volcano in Sicily" .)