King with three daughters (4)
I believe the answer is:
lear
'king with three daughters' is the definition.
(Shakespeare's King Lear)
This is the entire clue.
(Other definitions for lear that I've seen before include "of poetry?" , "Humorist, Edward --" , "Shakespear's king" , "Tragic Shakespeare king - quite real" , "Playful king and writer of nonsense verse" .)