Crossword Genius

Giant advance following release of equitable voting system? (6)

Ross

I believe the answer is:

ogress

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'giant' is the definition.
(I know that ogress is a type of giant)

'of equitable voting system?' is the wordplay.
'of' becomes 'o''.
'equitable voting system?' becomes 'gress' (I can't explain this - if you can you should give a lot more credence to this answer).
'o'+'gress'='OGRESS'

'advance following release' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for ogress that I've seen before include "Monstrous female" , "Scary female" , "Formidable woman" , "earsome lady" , "Particular nasty woman" .)

I've seen this clue in The Independent.
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