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All answers having "Truck" as clue:

3 Character Answers:

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RIG

VAN



4 Character Answers:

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HAUL

SEMI

TACO



5 Character Answers:

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ARENA

LORRY



6 Character Answers:

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ADVENT



7 Character Answers:

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AVIATOR

ELGRECO



8 Character Answers:

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APPARENT

DEALINGS



11 Character Answers:

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LANGOUSTINE