Maybe a real king? (4)
I believe the answer is:
lear
'king?' is the definition.
(I've seen this before)
'maybe a real' is the wordplay.
'maybe' is an anagram indicator.
'real' with letters rearranged gives 'LEAR'.
(Other definitions for lear that I've seen before include "Tragic king in play" , "Fictional king - English humorist" , "King -, Edward -" , "Lesson" , "of poetry?" .)