Ring found by Catholic in school with burn (6)
I believe the answer is:
scorch
'burn' is the definition.
(scorch is a kind of burn)
'ring found by catholic in school' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'found by' is a charade indicator (letters next to each other).
'catholic' becomes 'rc' (Roman Catholic).
'in' indicates putting letters inside.
'school' becomes 'sch' (abbreviation).
'o'+'rc'='orc'
'orc' put inside 'sch' is 'SCORCH'.
'with' is the link.
(Other definitions for scorch that I've seen before include "Burn on surface, char" , "Become burnt on the surface" , "Wither from exposure to heat" , "Singe" , "Burn superficially" .)