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All answers having "Blocks" as clue:

4 Character Answers:

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BARS

DAMS

TOYS



5 Character Answers:

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AREAS

CLOTS

FOILS

STEMS

STOPS



6 Character Answers:

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DETERS

STALLS



7 Character Answers:

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HINDERS

IMPEDES

OPPOSES

STYMIES



8 Character Answers:

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INHIBITS

OCCLUDES



9 Character Answers:

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OBSTRUCTS



13 Character Answers:

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CONSTRICTIONS