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All answers having "Barrel" as clue:

3 Character Answers:

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KEG

KEY

TUN

VAT



4 Character Answers:

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AGED

CASK

DRUM

PORK

TARN



5 Character Answers:

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CLIMB

CRATE

ORGAN

OVERA

QUITE



6 Character Answers:

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SCARED



15 Character Answers:

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CHAIRORGANHOUSE

PROCEEDSPEEDILY

WOODENCONTAINER