Crossword Genius

Miss a grand perhaps (6)

Ross

I believe the answer is:

joanna

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

'grand perhaps' is the definition.
I can't judge whether this definition defines the answer.

'miss a' is the wordplay.
'miss' becomes 'joann' (I can't explain this - if you can you should give a lot more credence to this answer).
'joann'+'a'='JOANNA'

Can you help me to learn more?

(Other definitions for joanna that I've seen before include "east end piano" , "Piano (rhyming slang)" , "One's played" , "Girl's name, piano" .)

I've seen this clue in The Independent.
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