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All answers having "Impede" as clue:

3 Character Answers:

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BAR

BOG

DAM

TIE



4 Character Answers:

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FOIL

SLOW



5 Character Answers:

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BLOCK

CHECK

DETER

ESTOP

STYMY

TIEUP



6 Character Answers:

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HAMPER

HINDER

HOBBLE

HOGTIE

RETARD

STYMIE

TRADER



7 Character Answers:

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INHIBIT



12 Character Answers:

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SHORTCIRCUIT