Rub out round empty fence causing uproar (8)
I believe the answer is:
brouhaha
'uproar' is the definition.
(brouhaha is a kind of uproar)
'rub out round empty fence' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'round' indicates putting letters inside.
'empty' becomes 'o' (**).
'fence' becomes 'haha' (haha is a kind of fence).
'rub' with letters rearranged gives 'bru'.
'bru' going around 'o' is 'brou'.
'brou'+'haha'='BROUHAHA'
'causing' acts as a link.
(Other definitions for brouhaha that I've seen before include "Stir" , "Great fuss" , "rumpus" , "Noisy fuss" , "Storm" .)