Possible Clues:

• An allusion (to)
• Character that directs one elsewhere
• Employer may want to read this new chapter in judge's grip
• With 52 Across, helpful person where books are borrowed
• Mention school subject, and again, railing about it
• Address about to be given border with neighbour? Engineers brought in
• Sports official not totally nice, not one to get testimonial
• Citation in a book or article
• An allusion to one's character and ability?
• Testimonial from first choice beginning to be ignored