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All answers having "Extends" as clue:

4 Character Answers:

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ADDS

JUTS

LIES



6 Character Answers:

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ADDSTO

OFFERS

RANGES

RENEWS

WIDENS



7 Character Answers:

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REACHES

SPREADS



8 Character Answers:

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PROLONGS



9 Character Answers:

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ELONGATES

PROTRACTS