Just one left with Cinderella, beaten in National (9)
I believe the answer is:
icelander
'national' is the definition.
(I've seen this before)
'just one left with cinderella beaten' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' (I've seen this in other clues) and 'an' is located in the answer.
'left' could be 'l' (common abbreviation) and 'l' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for icelander that I've seen before include "Nationality of citizen of Reykjavik" , "Northern European" , "Nordic person" , "someone from Reykjavik, probably" , "Kind of European" .)