Repeated prayers of model captured by a photographer scratching backside at shrine's opening (7)

'repeated prayers' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'model captured by a photographer scratching backside at shrine's opening' is the wordplay.
I cannot really understand how this works, but
'model' could be 't' (Ford Model T car) and 't' is found in the answer.
'a' could be 'an' and 'an' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'of' acts as a link.

Can you help me to learn more?