Whenever I see a crossword clue like 'Nabokov novel' I immediately think of 'Lolita', and that’s often where Humbert gets dragged into the grid. In straightforward American-style puzzles, constructors usually handle Humbert by pointing to his role: he’s the unreliable narrator and the book’s protagonist, so you’ll commonly see clues like 'Humbert in "Lolita"' => NARRATOR (8) or 'Humbert's target' => LOLITA (6). Those are quick, clean, and keep the solver focused on literary facts rather than the more uncomfortable specifics of his character.
Dig a little deeper into cryptic or British-style clues and things get more playful. Humbert Humbert’s doubled name is a constructor’s candy — it can clue repetition, reduplication, or a twin-letter pattern. For example, a clue might hint at a “double” component: 'Nabokov's doubled man' could nudge you toward a word meaning 'repeat' or 'ditto', or even directly to the phrase 'Humbert Humbert' if the enumeration allows. Cryptic setters also use surface texts like 'obsessed narrator' or 'title's lover' to point to 'Lolita' without being explicit about the moral darkness.
I enjoy how puzzles balance courtesy and cunning: they honor the canonical facts (title, narrator, protagonist) while letting clever clues play on Humbert's peculiar double-name and unreliable voice. It’s a nice little literary wink in a medium that loves economy of language and layered meaning.