Related Clues:

• Admonish
• Cry 'Heads up!' to
• Counsel, old-style
• Put on guard
• Counsel, old-style (anagram of DEER)
• Give tips to
• Give a heads-up to
• Explain
• Steer
• Raise red flags
• Notify of potential danger
• Old word meaning "counsel"
• Give a heads-up
• Issue a caveat
• Give an alert