Jolly nasty female replacing king with prince (5)
I believe the answer is:
happy
'jolly' is the definition.
(thesaurus)
I don't understand the rest of the clue.
(Other definitions for happy that I've seen before include "Doc's smiling pal" , "A not so low" , "One of the Seven Dwarves" , "Gleeful" , "Well-pleased" .)