Possible Clues:

• Crop grower or livestock keeper
• This person plunging into distant river is country worker
• Rancher is remote and runs after Kite
• Whistle-blower returning holding gun for yeoman
• One with a growing business?
• One whose work is always cropping up?
• One works the land
• One of those with growing concerns for character raising stock issues
• Person having stock of bacteria for germ warfare — murder, ultimately
• Most of those at the end of 11 down might have growing concerns