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All answers having "Attention getter" as clue:

3 Character Answers:

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HAM

HEY

PST

TAP

TST



4 Character Answers:

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AHEM

AHOY

BANG

BEEP

BELL

PSST



5 Character Answers:

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NUDGE



6 Character Answers:

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HEARYE

HEYYOU

YOOHOO



8 Character Answers:

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HEYTHERE