King Offa's kingdom in central England (6)
I believe the answer is:
mercia
'england' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?
'king offa's kingdom in central' is the wordplay.
I cannot really see how this works, but
'king' could be 'er' (abbreviation for Edward Rex, various English kings) and 'er' is found within the answer.
'central' could be 'c' (common abbreviation in various government acronyms) and 'c' is found within the answer.
The remaining letters 'mia' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for mercia that I've seen before include "Anglo-Saxon kingdom" , "Old English kingdom, once ruled by Offa" , "Former kingdom of central England" , "Former English kingdom" , "share of Albion?" .)