Possible Clues:

• Wreck aground despite exercising caution
• Fencing term
• Fully alert
• Suspicious about newspaper's leaders
• Like a sentry
• Alert and suspicious
• Sounds like threatening Swords with Garda duty?
• Vigilant, rung a crook getting into overdraft
• The watch that's kept for the Garda
• Vigilant, prepared for all contingencies