The phrase "a single interest of" is correct and usable in written English.
It can be used to refer to one specific interest or concern that belongs to someone or something.
Example: "The committee focused on a single interest of the community, which was improving local education."
Alternatives: "a sole interest of" or "one specific interest of".
The historic problem with Sark is that it has been dominated by a single interest for most of its recent history, that of the present Seigneur and his family before him.
"The historic problem with Sark is that it has been dominated by a single interest for most of its recent history, that of the present Seigneur and his family before him," the Barclays have said, through their lawyer.
A few days later, on 8 January 2017, Lloyds will scrap the current tiered interest rates on its Club Lloyds account and bring in a single interest rate of 2% on balances between £1 and £5,000.
Spare us the notion that the interests of a single interest group, in a single nation, should trump the rights of all other nations to protect their citizens.
Responses were received from 289 individuals, many of whom represented more than a single interest group, for a total of 582 represented areas of interest.
Today there is probably not a single interest, frivolous or serious, of man, woman, or child, that is not catered to by a magazine.
In theory, a failure to pay a single interest payment on a tranche of debt will trigger a demand from all bondholders for their money back.
Since then, Lisbon's objectives were undermined by the sheer economic inflexibility of having a single interest rate across an already very unequal European single currency zone.
The only other foreign policy issue that is decided not on the basis of the merits but because of the influence of a single-interest lobby is Cuba.
A single region-of-interest (ROI) that best delimited the lesion present was drawn, by an experienced radiologist, for each DCE-MRI study.
