What is the ruling on the alcohol (spirit) found in citrus peels? Is it pure, and is it permissible to eat? And does it defile clothing that is splashed with its spray?

Essential oils from citrus peels, like lemon, are permissible and pure, and there is no disagreement regarding this. However, if they are extracted to the point of becoming intoxicating, then drinking them is unanimously forbidden, and the rulings regarding the impurity of alcohol apply to them. The preponderant opinion is that they are impure.