Leapt wildly around the ring in sport (6)
I believe the answer is:
pelota
'sport' is the definition.
(pelota is a kind of sport)
'leapt wildly around the ring' is the wordplay.
'wildly' is an anagram indicator.
'around' is an insertion indicator.
'the ring' becomes 'o' (letter resembling a ring).
'leapt' with letters rearranged gives 'pelta'.
'pelta' going around 'o' is 'PELOTA'.
'in' is the link.
(Other definitions for pelota that I've seen before include "Basque ball game" , "Basque sport" , "Spanish game at Opel" , "SPORT/GAME" , "Spanish game played with a ball and wickerwork racket" .)