Possible Clues:

• Old sailor serves up what fishermen caught at the point and from bottom of oyster trap
• Renegade baseball player may be a professional killer
• Get angry when you see that is being such an animal exterminator
• Beastly trap for local counterintelligence unit perhaps
• Looks for whistleblower in trap
• Hunting gear for one 'with idle pipe and vesture piebald'?
• Vermin exterminator
• Maybe the Pied Piper gets a pair of animals in France, dear
• Rodent operative
• Bad character hanging round end of street is a professional killer