Possible Clues:

• Rover taking public transport to Portugal
• Broad, conclusively representative art retrospective
• One is inclined at last for this poor fellow to be on the move
• W.H. Davies was a super one
• Car park is a long walk
• Penny on public transport? Walk
• Vagrant - cargo ship
• Gin-soaked married woman who's promiscuous?
• Vagrant's steamer?
• Merchant ship