Possible Clues:

• Pigeonholed
• Conforming to stock idea
• Conforming to a stock image
• Dopey setter unfortunately expected to offer more of the same
• Conventional Tory with deepest constituents
• Hackneyed poetry poorly penned by hack
• Hackneyed poetry rewritten about horse? On the contrary
• Tired Tory with deep-set disorder
• Deep-set Tory cast as nutty professor, say
• Sound-system classified as standard