What is the most popular movie directed by Ron Clements?
Ron Clements refers to director = 'Ron Clements'; the most popular movie refers to movie_title where MAX(total_gross);
SELECT T2.name FROM movies_total_gross AS T1 INNER JOIN director AS T2 ON T2.name = T1.movie_title WHERE T2.director = 'Ron Clements' ORDER BY CAST(REPLACE(SUBSTR(total_gross, 2), ',', '') AS int) DESC LIMIT 1