I was surprised at all the posts on here indicating unfamiliarity with the 7 of the theme, although I do agree with spiny norman that the last name being omitted is a big flaw of the puzzle. I would guess that you would be hard pressed to find an American who did not grow up with at least the most familiar of his works. It seems he's nowhere near as popular in the UK.
For those not familiar, I think 18 is the key. The wordplay is straightforward enough, and the title is unusual enough to immediately pinpoint its creator, whether or not you have to search it. 18 was my first thematic entry.