This is another one of Elizabeth Spencer's diffused, discreet--or is it evasive, views of two marriages and a number of encroaching lives shuttling back and forth in time and place, Texas, New York, Washington, Italy. While the novel at times seems to lack definition, it is remarkably fluid and throws off a sense of life as it is--subject to chance and change--through desultory, tangential and incomplete experiences. ""No Place for an Angel"" is America, or so Irene tells Barry Day, a sculptor, whom she meets in Italy during the time when she becomes involved in an intensely sensuous affair with a native which guts her marriage to Charles. Then on