Behold a lot of correspondence about deity turning up in monastery (9)

'turning up in monastery' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'behold a lot of correspondence about deity' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'lot' could be 'm' and 'm' is found in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
'deity' could be 'ra' (Ra is an example) and 'ra' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?