noun
A club or organization for playing tennis, typically at a school or community level.
大学のテニスクラブに入った。
I joined the university tennis club.
テニスクラブの練習は毎週土曜日だ。
Tennis club practice is every Saturday.
テニス部 is more commonly used for school-based tennis clubs, while テニスクラブ can refer to any tennis club, including private or community ones.
Wasei-eigo (Japanese-made English) from 'tennis' + 'club'.