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All answers having "Backs" as clue:

5 Character Answers:

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DORSA

FUNDS

ISFOR

REARS



6 Character Answers:

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BETSON

STERNS



7 Character Answers:

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UPHOLDS



8 Character Answers:

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ENDORSES

REARENDS

REVERSES

SPONSORS

SUPPORTS



9 Character Answers:

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SIDESWITH