Related Clues:

• Surreptitious summons
• Conspiratorial "Hey!"
• Soft "Yoo-hoo!"
• After thought, the saint said this for attention
• Sibilant "Over here!"
• Certain conversation starter
• ''Ahem'' alternative
• Sound before 3 Down, maybe
• Soft attention-getter
• What? An end to the sentence?
• Attempt to attract attention from ship's staff
• Course objective to put on the end of a sentence, maybe
• Listen, there's more to say, by the way
• A word in your ear: civilian vessel's engaged in exercises
• Forgiveness is even academic