It only appears occasionally. I have no alarms set, no timers, stopwatch etc. running.
Android phone. Searching got no joy.
Update: it was a scheduled message in signal. Didn’t want to send my bestie memes too late at night. It does use the actual alarm icon though, weirdly.
Thanks everyone for your help!
If you run a tidy ship, you could go through the apps you might suspect, there is a “set an alarm” permission under settings -> apps -> app -> permissions -> three dots -> all permissions.
I don’t think stopping / clearing app data makes it go away if it’s do persistent, so you might have to resort uninstalling the apps that have this permission until it goes away.
Thanks. I was about to do this but another comment caused me to check scheduled messages. It was signal.
Edit: I went in here to look anyway and this would have definitely caught it. Thanks for the suggestion.