See all of your notifications first, then click clear all with THAT (Club topic) notification remaining. It'll not appear again
The continuity topic
also i wont since ive a habit of keeping the notifications of all disabled clubs ive been in
I still have a notification for "nothing for now. this club needs a revolution"
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If somebody posts a topic on any club and then an admin deletes it, it shows up as "/clubname has a new topic" then blank, but if you cross it out in the notifications bar it comes back