King Lear? (6)
I believe the answer is:
edward
I believe this clue is a double definition.
'king' is the first definition.
(I know that Edward is a King of England)
'lear?' is the second definition.
(I've seen this before)
(Other definitions for edward that I've seen before include "Jointly the most popular name for a king of England" , "Lear, perhaps" , "Lear, maybe" , "Boy" , "The Black Prince's name" .)