Use it for a change to cover burn in a religious ceremony (9)
I believe the answer is:
eucharist
'a religious ceremony' is the definition.
(I know that Eucharist is a type of sacrament)
'use it for a change to cover burn' is the wordplay.
'for a change' indicates anagramming the letters.
'to cover' means one lot of letters goes inside another.
'burn' becomes 'char' (charring is a kind of burning).
'use'+'it'='useit'
'useit' anagrammed gives 'euist'.
'euist' going around 'char' is 'EUCHARIST'.
'in' acts as a link.
(Other definitions for eucharist that I've seen before include "Mass" , "Consecrated bread" , "church service" , "Bread and wine" , "host" .)