Crossword Genius

Are we done with first passage defending faith occasionally? (2,4,3)

Ross

I believe the answer is:

is that all

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

'passage defending faith occasionally?' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'are we done with first' is the wordplay.
I cannot quite see how this works, but
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is present in the answer.
'first' could be 'ist' (ist resembles 1st) and 'ist' is found within the answer.
This explanation may well be incorrect...

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I've seen this clue in the Sydney Morning Herald.
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