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The handle must be removed to allow access to the retainer clip, then the cartridge pulls out. You may need a cartridge puller if the faucet is old.
The o rings inside the cartridge have become either faulty, worn or perished. You need to replace the cartridge for you to solve this problem.
if it is a single lever faucet the cartridge needs to be replaced. check the supply valve under the sink first,
They either have a cup and spring that stops the water or you change a cartridge. Also a couple of O rings to seal around the handle. Shut the water off, take the handle off and there is a nut holding the stem in place. Remove the nut and pull straight up on the stem. It is either a cartridge or there will be a black rubber cup in the hole with a spring under it. Single handle has two of them. Replace both the cup and spring and reassemble. If a cartridge, replace it making sure it goes in the same way the old one was sitting. There should be a small notch in the faucet and a matching tab on the cartridge
absolutely!
Turn the water off to the faucet. Remove the handle. The top of the faucet should unscrew to get to the ball valve. Replace the valve and gaskets then reassemble the faucet.
No conversion, it would need to be replaced with a single handle faucet.
The correct term would be a single hole faucet. You can not find anything about a single hold faucet on google. Single hole faucets are typically not the first choice of faucets.
Change the faucet, either one will mount on the sink.
Short handed
The U-shaped retainer clip on a shower faucet can be removed by using a pliers to pull it off. The pliers should be a needle-nosed shape to grasp the U-shaped retainer clip more easily.
Delta faucet is one of the better brands on the market and if you call their 800 number and give them the model number or type single lever or two handle they will send you the parts and instructions on how to replace the defective diverter