Clubhouse is apparently fairly leaky. It bills itself as an exclusive new form of social media and is iPhone-only and invitation-only. However, that doesn’t mean that everybody can’t listen in. A hacker just proved as much by accessing several supposedly private audio streams. Additionally, all of their back end infrastructure is located in China, letting Chinese authorities listen in as well.
There are very few services that are actually secure. We used to assume that our conversations are private, but that assumption rarely holds. A US school board were bad-mouthing parents on a Zoom they thought were private, but the recording was public. They have now all resigned.
If you have confidential information that will be valuable to an adversary, talk about it in a meeting room in the office. And leave your phones outside.