Guardian breaking garden pot (9)
I believe the answer is:
godparent
'guardian' is the definition.
(I have seen 'Religious guardian ' mean 'godparent' so perhaps 'guardian' could also mean 'godparent')
'breaking garden pot' is the wordplay.
'breaking' indicates an anagram.
'garden'+'pot'='gardenpot'
'gardenpot' anagrammed gives 'GODPARENT'.
(Other definitions for godparent that I've seen before include "Religious guardian" , "Baptism sponsor" , "as one responsible for charge" , "Pet dragon (anag)" .)