Wall Street dealers made it tougher for hedge funds to finance trading of securities and derivatives in the three months through November, a Federal Reserve survey showed today. Responses “indicated a broad but moderate tightening of credit terms applicable to important classes of counterparties,” especially hedge-fund clients, trading real estate investment trusts and nonfinancial corporations, according to the quarterly survey of senior credit officers at 20 dealers covering the period of September to November. The central bank released the report in Washington.