Related Clues:

• "The only thing we have to ___ is ..."
• Alarm that's loud to a listener
• Fright to the max
• Risk having airmen standing around back of plane
• Aviators reversed bearing in alarm
• Apprehension of fare dodging?
• Concern for fellow listener
• Loud accurate alarm
• Reaction of some to 19, loudly hearing organ
• Shock for king in battle
• Be afraid
• Sudden alarm
• Analysis discussion
• Not just nerves
• Horror