Rings the wrong shop about nothing! (5)
I believe the answer is:
hoops
'rings' is the definition.
(I know this)
'wrong shop about nothing' is the wordplay.
'wrong' is an anagram indicator.
'about' means one lot of letters goes inside another.
'nothing' becomes 'O' (looks like zero - 0).
'shop' anagrammed gives 'hops'.
'hops' placed around 'o' is 'HOOPS'.
'the' is the link.
(Other definitions for hoops that I've seen before include "Small arches in croquet" , "They support the nets in basketball" , "Jump through these to undergo test or ordeal" , "See 5" , "Rings to go through?" .)