Related Clues:

• Stumped solvers' requests
• One of 39-Across
• Suggests
• Fingerprint or dropped handkerchief, say
• This, for example
• Detective's need
• Suggestions
• Print, maybe
• It may be found with a magnifying glass
• Guiding light?
• Inkling
• Fingerprint, perhaps
• Some people can't take them
• Sleuth's find
• Airhead's lack?