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!
Network time all the way. Good idea though.
I used to have a clock app from f-droid installed but got rid of it ages ago as it wasn’t working properly for alarms. Double checked and I did uninstall it back then.
Scrolled through all my other apps (I run a relatively tidy ship so it didn’t take too long) and I can’t see anything that I think would be setting an alarm.