Skulltulas have spun sticky webs all over the Skyview Temple. Many of them still lurk within its depths, hanging from the ceiling by their strings. You can cut them down with the Beetle to get them back on the ground, then flip them over with a careful uppercut with your sword or a well-placed Bomb explosion to get them on their backs. From there, a simple Finishing Blow will squish them. Alternatively, you can spin them around with your sword while they're still suspended and, with good timing, stab them right in their glowing guts.
Find out more at Zeldapedia: Skulltula.