HILLSBORO. 0., Sept. 21—An attempt by John Cluxton, 60 shoot first his wife, then himself, failed yesterday but left both in the HiLlsboro hospital in critical condition. The shooting occurred, officers said, when Mrs. Cluxton left the farm eleven miles south of here to live with son, apparently in an ef fort to avoid family trouble. Clux ton followed, officers said, shot and wounded his wife twice, then turned the gun on himself, firitS once into his abdomen and once under the heart, authorities re ported,