Viceroy, he had entered Kiev another way (7)
I believe the answer is:
khedive
'viceroy' is the definition.
(thesaurus)
'he had entered kiev another way' is the wordplay.
'he had' becomes 'hed'.
'entered' is an insertion indicator.
'another way' indicates anagramming the letters.
'kiev' is an anagram of 'kive'.
'hed' inserted within 'kive' is 'KHEDIVE'.
(Other definitions for khedive that I've seen before include "Turkish viceroy" , "Former viceroy of Egypt" , "Egyptian viceroy" , "Old Ottoman boss" .)