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All answers having "Burden" as clue:

3 Character Answers:

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NIB

RHO

TAX



4 Character Answers:

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DEBT

DRAG

LADE

LIME

LOAD

NEED

ONUS

PAIR

TASK

YOKE



5 Character Answers:

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ASTON

CARGO

CHORE

ONERE

YACHT



6 Character Answers:

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EGRESS

LUMBER

POTTER

SADDLE

WEIGHT



7 Character Answers:

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EXCERPT

INCUBUS

OPPRESS

REFRAIN



8 Character Answers:

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ENCUMBER

HARDSHIP

LOADDOWN



9 Character Answers:

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ALBATROSS

CUMBRANCE



11 Character Answers:

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BELLBOTTOMS

ENCUMBRANCE

IRISHCOFFEE



13 Character Answers:

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BOBSYOURUNCLE

REFLEXOLOGIST