Hello to all community members. I am preparing for the IELTS listening and rehearsing the cambridge books IELTS listening tests. I marked one question wrong and when i checked the typescript and checked the correct answer but I'm unable to understand the meaning of the sentence which shows the clue for the correct option. The sentence is
I also joined the debating society, It's fun, but with all rehearsing I'm doing, Something has to go, I'm afraid that's the one.
So here I didn't get the correct meaning of this sentence and particularly the last of the sentence. Any help would be appreciated to grasp the meaning of this sentence.