Possible Clues:

• Vaccinate
• Immunise
• Jab from Ali, one needing cut treated
• Infect on purpose
• Inject syringe's centre and roughly clean out
• One way to protect an unusual coin you heard, at the end of the day
• Copper delayed after single refusal to give protection
• Give a jab with a coin to make you dead at last
• I clean out wound to protect from infection
• Do a travel clinician's job, say