Did you perchance mean ringneck?
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Wiktionary
Examples
“ringfence'-especially when used as a verb-this may be a banner weak for you.”
“Why he made no reference to Scotland Yard's strategy, accepted by prosecutors, to "ringfence" evidence to suppress the names of "sensitive" victims.”
The Guardian: Phone hacking: Met police put on spot by ignored leads and discreet omissions
“French President Nicolas Sarkozy and German Chancellor Angela Merkel have spoken out against foreign investors, with Germany saying it would consider legislation to "ringfence" companies in sensitive sectors.”
“Why does Osborne "ringfence" defence when everyone knows its budget is a bankruptcy waiting to happen, when Labour ministers bought the wrong kit for wars that they insisted it fight?”
“She knows full well that the Metropolitan police are part of the problem, since their decision to "ringfence" the investigation.”
“But it is important to 'ringfence' rather than erode an adequate budget for top-grade innovative researchers in any field: the value of our universities lies in the transformative discoveries that emerge unpredictably and unplanned.”
“Downing Street has been eager to ringfence the UK economy from the problems of the eurozone, with the result that chancellor, George Osborne, and his officials have not attended the current meetings to discuss the Greek bailout.”
The Guardian: Treasury minister's faith in euro falters amid Greek debt crisis
“The assumption in the financial markets is that a bailout for Portugal is inevitable, and that the real test for European policymakers will be whether they can ringfence Spain.”
The Guardian: Estonia gets cool welcome from a eurozone in crisis
“His cuts mean some areas have 25% less than last year to spend on early years services and the loss of the ringfence means councils don't even have to spend that money on children.”
The Guardian: Don't renege on your broken Sure Start pledge, Mr Cameron | Letters
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Looking for tweets for ringfence.

frogapplause France urges EU to freeze spending - but ringfence agriculture
link Apr 15, 2011