Clean it carefully with hydrogen peroxide. Infection will do more damage than the cut off toe. Then get the hen out of the hen house you cant have it walking around in poop and dirt with a cut like that. Put it in a box, a dog crate, a large empty scrubbed out watering trough etc. on clean newspaper or puppy pads. I would go with cheap generic puppy pads. The chicken needs something for pain. Get Lidocaine cream from the drug store, ask the pharmacist for some kind of OTC product with Lidocaine. Use a broad spectrum antibiotic cream like Muciprin or bacroban. Do not let infection set up. you might also want to soak it in an iodine wash product. Keep it bandanged. Use gauze padding and wrap it in gauze cloth bandages.