Possible Clues:

• It's crazily included in Finnegan's Wake — perhaps too crazily
• Struggling apropos the detail of punctuation
• Greengrocers missing sign?
• To a shopper, oddly enough, it may indicate possession
• A character in 'Howard's End'
• Frequently unwarranted intruder presenting a job for the right workman?
• Qur'an part
• Mark in exam's perhaps too awful
• What's essential part of Lord's, and it's often overlooked
• Sign made by pastor with hope