Smallest unit of life ... or when used with "white," disease-fighting component of blood, also called a leukocyte

Number that follows nine3 Tit for ___3 Australian bird that's the world's second-largest after the ostrich3 "___ so fast, mister!" ("Slow down!")3 Double-helix genetic material: Abbr.3 Play-___ (children's clay toy)3 Unpleasant sound ... or a word with "white" to mean a low, humming sound that results from many combined frequencies5 Sleep ___ (disorder that makes it hard to breathe)5