The phrase "alone a dozen" is not correct and does not make sense in written English.
It seems to be an incomplete expression and lacks context to determine its intended meaning.
Example: "I can handle a dozen tasks, but alone a dozen seems overwhelming."
Alternatives: "just a dozen" or "merely a dozen".
In the last week alone, a dozen foreigners have been seized.
In Westchester County alone, a dozen communities have either built new libraries or added substantially to their old buildings within the last several years.
In track and field alone, a dozen runners had run the four-minute mile in the three years since Roger Bannister first did it.
One beachmaster bull – the alpha male of the species – sits among his harem, while another, slightly smaller male, lies alone a dozen yards away, resting his chin on a slab of rock with the look of a scolded dog.
This guy was right out of Freaks and Geeks and could not possibly be considered a threat to anyone, let alone a dozen angry skinheads.
"The retaliation, the reprisal, is that in her case and her case alone, of a dozen cases, they are departing from the established practice, only because there is a whistleblower involved who blew the whistle on the fact that the SEC wasn't handling Madoff style cases five years ago".
Gagosian alone has a dozen galleries.
In the last two weeks alone, half a dozen Sony Web sites and servers, including some in the United States and Brazil, have been breached.
In Alabama alone, almost a dozen children died in day care facilities in the two years before the state began upgrading its licensing requirements in 2000.
In July alone, half a dozen donors each contributed $101,700 to the legal account, including Home Depot co-founder Bernard Marcus and San Francisco investment company executive Charles Schwab, FEC filings show.
In 2002 alone, about a dozen large store chains, including Linens 'n Things and BJ's Wholesale Club, introduced credit card loyalty programs.
