Possible Clues:

• Adult with cold: sniffer about to receive care and strong tissue?
• Vulnerability perhaps one tends to get after a chill
• An extremely hostile aim towards part of leg
• Part of leg hurts? I will stay in - keep nursing!
• Body tissue that's reconstituted in the lad's clone
• One racing tortoise not about to cross finish, if he injured this?
• Bill suffering most in police college with sinew
• A viral infection is abroad, lengthwise in lower leg
• Part of leg badly beset by pains - nurse operating
• An extremely cold object on part of leg