The phrase "accusation being" is grammatically correct and can be used in written English.
It is often used to introduce a statement or fact about an accusation. Example: The accused denied all the allegations, with the main accusation being that he had embezzled company funds.
A new accusation being made against Ofsted is that "superhead" Rachel de Souza's Inspiration Trust academies knew in advance when its inspectors were coming.
The accusation being fired against the recovered memory therapists was that of "iatrogenesis" - the moulding of a patient's trauma by an incompetent doctor's own ministrations.
But, here too, L&H has long been suspected of being in a class of its own, the main accusation being that it artificially boosts sales by doing deals with "related parties".
And the focus on Mr. Dixon has recently become more intense because of an accusation being privately levied by some of his former colleagues: Mr. Dixon may have a conflict of interest because his company is being partly financed by people and companies that he and his team of journalists are supposed to be writing commentary about.
Nor was there a single figure, in Britain, against whom pent-up resentment, pointed either backward or forward, could be unleashed: no President Obama (the covert accusation being, "You really think you can put an African-American in charge, for eight years, and get away with it?"), and, needless to say, no Hillary Clinton to be treated like a medieval sorceress or a common crook ("Lock her up").
Almost certainly not, but that's the accusation being levied by independent film maker Jehanzeb Dar, saying that the part of The Prince "really needed to go to someone who's Persian".
