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All answers having "Explosive device" as clue:

3 Character Answers:

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BAY



4 Character Answers:

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BOMB

LOFT

MINE

NEAT

SEEM



6 Character Answers:

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PETARD



7 Character Answers:

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GRENADE



8 Character Answers:

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LANDMINE



9 Character Answers:

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SMOKEBOMB



11 Character Answers:

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ALLPOWERFUL