Kingdom not fancied by many (5)
I believe the answer is:
realm
'kingdom' is the definition.
(thesaurus)
'not fancied by many' is the wordplay.
'not fancied' becomes 'real' (I've seen this in other clues).
'by' says to put letters next to each other.
'many' becomes 'm'.
'real'+'m'='REALM'
(Other definitions for realm that I've seen before include "department" , "Area of influence" , "the UK, perhaps" , "where ruler holds sway?" , "Empire - state" .)