Possible Clues:

• Publisher's emblem
• Work hard during stop to find bookmark
• Work hard to penetrate punctuation mark by which publisher may be recognised
• Publisher’s emblem
• Pass around phone ignoring point with bookmarker
• Publisher's emblem or imprint on the title page of a book
• Publisher's device: it shuts in hour after work
• Publisher's imprint or 15 across
• Publisher's emblem or imprint
• Publisher's imprint or emblem