The phrase "as a single rogue" is correct and usable in written English.
It can be used to describe someone acting independently or outside of a group, often with a connotation of defiance or nonconformity.
Example: "He decided to take on the challenge as a single rogue, believing he could succeed where others had failed."
Alternatives: "acting alone" or "as a lone wolf".
As we are gripped by the unfolding scandal, it's easy -- and dangerous -- to see this as a story about a single rogue outfit, just another accountability scandal in the epic and tragic reality of this war.
"It was not a single rogue supplier as Walmart has claimed — there were several different U.S. suppliers working for Walmart in that factory," Mr. Nova said.
In a week of fast-moving developments, James Murdoch testified that he had not been aware in 2008 of evidence that phone hacking at The News of the World went beyond a single "rogue reporter," as the company then maintained.
The e-mail, to the longtime News of the World reporter Neville Thurlbeck, contained transcripts of cellphone conversations, proof that the hacking was more widespread than the work of a single rogue reporter, as the company initially claimed.
Update: A Facebook spokesperson tells me, "Recently, several Pages made unauthorized posts as a result of actions from a single rogue administrator of these Pages.
That's why, to anyone with any journalistic nous, the peddling of the line that hacking was the action of a "single rogue reporter" operating in splendid isolation was as daft as it was unbelievable.
It only takes a single rogue iPhone to spawn a thousand exact replicas as far as dimensions, shape, and materials.
Simon is now depicting itself as a reputable company that fell victim of a single rogue employee, and so far it doesn't look like any other Simon employees were involved.
The result in 2010 was so tight that a single rogue backbencher, Geoff Shaw, could cause havoc.
Coulson maintained that hacking was the work of a single "rogue reporter".
