Clic novels???

i read the great gatsby [AMAZING] and i wrote a 2 page summary on it, but i have to write a paragraph on what makes a clic a clic. i have to have three things, and all i have is "stands the test of time" its so hard to think of something that i actually have to expand on because i also have to relate these reasons in another paragraph on why the great gatsby is a clic. please help with any suggestions you may have. thanks!!!