Related Clues:

• Nudge
• Fingerprint or dropped handkerchief, say
• Helpful ___
• Not say directly
• Suggestion
• This, for example
• Detective's need
• Insinuate
• Slight amount
• Print, maybe
• Innuendo
• It may be found with a magnifying glass
• Guiding light?
• Inkling
• Fingerprint, perhaps