You must be a man of experience. I had a bug stuck on my earwax and that describes the sound exactly! Not a cicada though, a mosquito. I know that because I heard that characteristic dentist’s drill whine get VERY LOUD then a tiny splat then “FFFFL. Flllala, flllalalal,flaalalFFLLALLALAFLAL...etcetcetc!" Fortunately she got stuck in such a way the she couldn’t bite me. I had to endure the sound until she died in there.