Ring about right nuisance on the internet (5)
I believe the answer is:
troll
'nuisance on the internet' is the definition.
(an internet troll)
'ring about right' is the wordplay.
'ring' becomes 'toll' (tolling is a kind of ringing**).
'about' is an insertion indicator.
'right' becomes 'r' (common abbreviation).
'toll' enclosing 'r' is 'TROLL'.
(Other definitions for troll that I've seen before include "Fish - cave-elf" , "Try to catch fish" , "online commenter" , "Fish by trailing a baited line" , "Mythological being" .)