Crossword Genius

Dyslexic witch relies on this? (5,5)

Ross

I believe the answer is:

spell check

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

'relies on this?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'dyslexic witch' is the wordplay.
I cannot quite understand how this works, but
'witch' could be 'spell' (spelling is a kind of witching) and 'spell' is found within the answer.
The remaining letters 'check' 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?

(Another definition for spell check that I've seen is " scrutinise document".)

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