People in uproar about island drivers (5,4)
I believe the answer is:
human race
'people in uproar' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'about island drivers' is the wordplay.
'about' is an insertion indicator.
'island' becomes 'humane' (I can't explain this - if you can you should give a lot more credence to this answer).
'drivers' becomes 'rac' (Royal Automobile Club).
'humane' enclosing 'rac' is 'HUMAN RACE'.
Can you help me to learn more?
(Other definitions for human race that I've seen before include "We are all involved" , "Homo sapiens" , "Mankind" , "All of us" , "See 8" .)