King of the fairies (6)
I believe the answer is:
oberon
'king of the fairies' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oberon that I've seen before include "Satellite" , "Shakespearean role" , "...[IN DREAM] with king" , "Titania's king" , "charming king" .)