We are going with 'a fair crack of the whip'
Made famous by the ill-fated former Prime Minister Kevin Rudd, who enjoyed using Australian slang to speak to the electorate and often pleaded for a "fair suck." The phrase generally means that you want to be treated fairly.
"Fair suck" was coined by struggling Australian families who shared droppings of tomato sauce to flavor their meat. Such was the hard life that all they wanted was an equitable suck. In the fields, they needed a "fair crack of the whip." Fair go, mate.