Possible Clues:

• Arthur's an individual who's crafty
• Craftsman's prejudiced when penniless
• A strain, working, for him?
• Trains a new mechanic, maybe
• It would appear that Arthur's an operative
• The manual worker having little heart is anxious
• That's no trader, but he's got a trade
• Skilled trade or craft worker
• A manual worker having to take a train's quite wrong
• Skilled workman or craftsman