* The name is misspelled or a variant spelling. Double-check the name for any errors.
* The author is not well-known or published under a different name. It's possible the author uses a pen name or has only published independently.
* The author is not yet public. It's possible the author is still working on their writing and hasn't published anything yet.
To find out more about this author, you could try:
* Searching online databases like WorldCat or LibraryThing. These databases contain information about books and authors.
* Looking for online reviews or articles about the author.
* Contacting libraries or literary organizations in the author's likely location.
Without more information, it's difficult to say whether Arthur Denis Clift is a real author or not.