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!
Not sure it applies but maybe it’s a reminder from another app, Google Assistant or other? Clear the cache on your clock app just in case and reboot
Just updated the comment above yours. It was a scheduled message in signal. Thanks!