Crossword Genius

A sermon delivered at Mount St., Mayfair?

Ross

I think it could be either:

Which length description are you looking for?:

4,7

11*

goodaddress

I'm a little stuck... Click here to teach me more about this clue!

'a sermon delivered at mount st mayfair?' is the definition.
I can't tell whether this definition defines the answer.

'sermon delivered at mount st mayfair?' is the wordplay.
I cannot really see how this works, but
'sermon' could be 'address' (I've seen this before) and 'address' is found within the answer.
The remaining letters 'good' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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