WordNet sense 1 (water soaked soil; soft wet earth):

mud

WordNet sense 2 (United States politician responsible for the Missouri Compromise between free and slave states (1777-1852)):

Henry Clay, the Great Compromiser

WordNet sense 3 (United States general who commanded United States forces in Europe from 1945 to 1949 and who oversaw the Berlin airlift (1897-1978)):

Lucius Clay, Lucius DuBignon Clay

WordNet sense 4 (the dead body of a human being):

cadaver, corpse, remains, stiff