Shakespeare's king of the fairies (6)
I believe the answer is:
oberon
'shakespeare's king of the fairies' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oberon that I've seen before include "Titania's consort" , "Fairy king (AMND)" , "charming king" , "Borneo (anag)" , "Titania's husband" .)