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All answers having "Melt" as clue:

3 Character Answers:

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HAW



4 Character Answers:

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FUSE

THAW

TUNA



5 Character Answers:

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DEICE



6 Character Answers:

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SOFTEN

UNTHAW



7 Character Answers:

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DEFROST

ENDORSE

LEARNED

LIQUEFY



8 Character Answers:

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DISSOLVE



11 Character Answers:

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FUNDAMENTAL

STONESTHROW