Successor to Ximenes got up and embraced one little girl or another from Cornwall (7)

'cornwall' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'successor to ximenes got up and embraced one little girl or another' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is found in the answer.
'girl' could be 'del' and 'del' is found within the leftover letters.
This explanation may well be incorrect...

'from' is the link.