Possible Clues:

• Self-denying, leading severely simple life
• It's for one counsel to quote this back with no pleasure
• Self-disciplined person
• One practising self-denial as a discipline
• Caste, I see, is pure and simple
• Recluse accepted backing sleuth inside, like this
• How senior counsel pure and simple might get to cite this wrong
• 'A sect, I see, for one that's simply living (7)'
• Hermit with strange cat is hanging around church
• Hardly a hedonist