The novel by Rousseau that might be the answer to this crossword clue could be 'Emile, or On Education'. It's a significant work that contains his ideas on education and human nature. Rousseau was a very influential philosopher, and his novels often carried his philosophical thoughts. 'Emile' was written in a way to illustrate his ideas about how a person should be educated from childhood to adulthood, and it was quite revolutionary for its time.
One of the most famous Nabokov novels is 'Lolita'. It's a controversial yet highly regarded work that tells the story of Humbert Humbert's obsession with a young girl. The novel is known for its complex narrative structure and Nabokov's masterful use of language.
A clue for a body of fiction could be 'fiction book' or 'imaginary tale'. It really depends on how the crossword setter wants to phrase it. Sometimes they might use a synonym or a more creative description to make it challenging.
Epics could also fit. Epics are long narrative poems or stories that often deal with heroic deeds and adventures, so they are a great match for the 'long stories' crossword clue. They usually have a complex plot and a large number of characters.
An innovative idea. Since 'novel' also means new and original, an innovative idea could fit the crossword clue. It could be a fresh concept in various fields like technology, art, or business.
Some clues for a reminiscence novel could be 'Thoughts of yesteryears' or 'Sentimental journey tale'. They capture the essence of looking back and sharing past experiences.