Here is another haiku from Clark Ashton Smith (CAS) that was unpublished in his lifetime. As it is not available on The Eldritch Dark, here is the complete text:
Patiently she smiled:
A mother with her child.
I believe that in the title of this short poem CAS is using a less-familiar meaning of the word "prostitute", one that the Shorter Oxford English Dictionary defines as "A person entirely or abjectly devoted to another."
All the same, it's a curious word choice, given the strong (mostly negative) associations of the more common usage of the word!