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All answers having "Space" as clue:

3 Character Answers:

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AGE

AIR

GAP

JAM

RHO



4 Character Answers:

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AREA

HOLE

ROOM

SHOE

VOID



5 Character Answers:

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CADET

CRAWL

ETHER

FINAL

OPERA

OUTER

REALM



6 Character Answers:

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CADETS



7 Character Answers:

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OPENING



8 Character Answers:

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INTERVAL



9 Character Answers:

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ELBOWROOM

OPENBLANK