Possible Clues:

• One advancing argument should make it stand up
• Adversary turning up in far-flung surroundings
• Policeman's set on worker, one argues
• Provoker of controversy rising up, outwardly aloof
• One who argues
• He may argue policeman's set on worker
• One engaged in argument abstracted around bar largely
• Striker, perhaps, put through hell by worker
• With the litigant who turns up, unfriendly all round