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All answers having "Clout" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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BASH

BIFF

BLOW

HEFT

NAIL

PULL

SOCK

SWAT

SWAY



5 Character Answers:

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JUICE

SAYSO



6 Character Answers:

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MUSCLE

WALLOP



8 Character Answers:

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LEVERAGE

PRESTIGE