* Revived UN sanctions tighten economic noose on Islamic Republic * Sanctions prompted by impasse in negotiations to curb Iran's nuclear and ballistic missile programmes * With public anger simmering, clerical elite scrambling to avert economic meltdown, shore up rule * Ordinary Iranians increasingly struggle with soaring prices, shrinking incomes (Tweaks headline) By Parisa Hafezi DUBAI, Oct 21 (Reuters) – Iran's economy is at risk of simultaneous hyperinflation and severe recession, officials and analysts say, as clerical rulers scramble to preserve stability with limited room to manoeuvre after a snapback of U.N. sanctions. They followed a breakdown in talks to curb Iran's disputed nuclear activity and its ballistic missile programme. Diplomacy to resolve the deadlock remains possible,

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