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!
Do you use tasker or any automation app? Anything time based will trigger the clock.
Ah I eventually discovered that it was a scheduled signal message. Cheers though.