Ruler having no charm, unfortunately (7)
I believe the answer is:
monarch
'ruler' is the definition.
(I know that monarch is a type of sovereign)
'no charm unfortunately' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'no'+'charm'='nocharm'
'nocharm' anagrammed gives 'MONARCH'.
'having' is the link.
(Other definitions for monarch that I've seen before include "Butterfly (emperor, say?)" , "Crowned head" , "Eg, king, queen, emperor" , "Butterfly - ruler" , "King or butterfly" .)