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All answers having "Obstruct" as clue:

3 Character Answers:

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BAR

DAM

JAM

RHO



4 Character Answers:

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CLOG

SNAG

STOP



5 Character Answers:

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BLOCK

DAMUP

ESTOP

ICEIN

JAMUP

TIEUP



6 Character Answers:

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CLOGUP

HINDER

IMPEDE

OPPOSE

RETARD

STOPUP

STYMIE



7 Character Answers:

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BLOCKUP

OCCLUDE



8 Character Answers:

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REVIEWER



9 Character Answers:

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BARRICADE