Incredible French one ready in Rio? (6)
I believe the answer is:
unreal
'incredible' is the definition.
(thesaurus)
'french one ready in rio?' is the wordplay.
'french one' becomes 'un' ('one' in French).
'ready in rio?' becomes 'real' (I can't explain this - if you can you should give a lot more credence to this answer).
'un'+'real'='UNREAL'
Can you help me to learn more?
(Other definitions for unreal that I've seen before include "Dreamlike" , "Not actual or credible" , "fake" , "Artificial, insubstantial" , "Not true to life" .)