Chatted about paradise welcoming St Ignatius, initially ordained earlier (13)

'ordained earlier' is the definition.
Although both the answer and definition are past participle verbs, I can't see how they can define each other.

'chatted about paradise welcoming st ignatius initially' is the wordplay.
'chatted' becomes 'prated' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' means one lot of letters goes inside another.
'paradise' becomes 'eden' (Garden of Eden).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'initially' says to take the initial letters.
The initial letter of 'ignatius' is 'i'.
'prated' going around 'eden' is 'predenated'.
'st'+'i'='sti'
'predenated' placed around 'sti' is 'PREDESTINATED'.

Can you help me to learn more?