A recent federal decision illustrates how an insurer must defend an entire suit as long as a single claim in it is potentially covered. Further, that exclusions must clearly apply to preclude such a duty.In Cincinnati Insurance Co. v. AW Dynamometer Inc., No. 1:17-CV-01164, 2018 U.S. Dist. LEXIS 154372 (C.D. Ill., Sept. 11, 2018), Chief U.S. District Judge James E. Shadid of the Central District of Illinois ruled that …