Now, an explanation on the Clawshots. They use a targeting system much like the Slingshot or the Gust Bellows – you point and press A to trigger the effect. What is the effect? You can be drawn to certain target-like tiles in the area (they are scattered throughout the Desert). You do the same with vines, too! I think that’s it though – unlike the Hookshot of Wind Waker, you cannot use it to grab treasure. sigh
Anyhow, go west upon regaining control to find one such Clawshot target. Hit it with the aforementioned item and get on the ledge to find a random treasure in the chest. Then go to the northeastern portion of the Desert to find a path under the sand leading to a narrow looped path you previously could not access. You can now go to that path, and then Bomb the northeastern wall to find a cavern. Go into it and defeat some Yellow Chuchus to find a chest at the end; inside it, you’ll find a Piece of Heart!
Nearby should be a canyon of quicksand, completely filled with Clawshot targets. Use the Clawshots to go from target to target. At the end of this “path”, you’ll find a Goddess Cube. Hit it with a Skyward Strike, then drop down to the hidden path. Follow it straight and go towards the cage filled area. There, Clawshot the quicksand pit target to find another Goddess Cube. Hit it with a Skyward Strike.
From there, continue westward and past the Hrok’s tree. Clawshot onto the wall opposite you to find a chest (Red Rupee) and a mine cart. Push the latter off of the ledge for a future shortcut. Next, follow your little shortcuts made in previous trips to the sandfall in the west. Once there, hop onto the higher ledge and hit the Clawshot target with the Clawshots to get on the ledge. Go into the caverns.