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All answers having "Get back" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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REAP

RSVP



5 Character Answers:

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GAFFE

REPLY

REWIN



6 Character Answers:

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AVENGE

RECOUP

REDEEM

REEARN

REGAIN

RETAKE



7 Character Answers:

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LORETTA

RECLAIM

RECOVER



8 Character Answers:

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REASSERT

REOBTAIN

RETRIEVE



9 Character Answers:

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REPOSSESS

RETALIATE