It's yet to be confirmed a foreign professional isn't finished on range (8)
I believe the answer is:
unproven
'finished on range' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives sometimes mean the same thing.
'it's yet to be confirmed a foreign professional isn't' is the wordplay.
I cannot quite understand how this works, but
'be' could be 'prove' (proving is a kind of being) and 'prove' is found within the answer.
'a foreign' could be 'un' ('a' translated into French) and 'un' is found within the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for unproven that I've seen before include "Not demonstrated as true or factual" , "Verdict" , "flat bread?" , "Not established as fact" .)