Possible Clues:

• Walker - one going on and on?
• Rose like a parson in a pulpit
• Walker (in countryside)
• Periodical taker of country walks
• Nash model
• One who might incur blame going round in a posh car ?
• Rose King, novelist
• Presumably one goes on and on about walking?
• River thriller writer mentioned in eighteenth-century periodical
• Bishop accepts blame surprisingly for Rose