Yes please
SELECT T1.clubname from club as T1 join member_of_club as T2 on T1.clubid  =  T2.clubid group by T2.clubid order by count ( * )  desc limit 1
Finding the club with the most members; club's name corresponds to T1.clubname; joining tables club and member_of_club on clubid; grouping results by clubid; ordering results by count in descending order; limit 1 to get the top result.