Crossword Genius

Mum in Blockbuster a female returning holy book (7)

Ross

I believe the answer is:

fatimah

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

'mum in blockbuster a' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'female returning holy book' is the wordplay.
I cannot really see how this works, but
'female' could be 'fatima' (I've seen this before) and 'fatima' is found within the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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