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All answers having "Compact" as clue:

3 Character Answers:

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CAR



4 Character Answers:

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AUTO

DISC

FIRM

HARD

SNUG

TAMP

TRIM



5 Character Answers:

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CLOSE

COUPE

DENSE

SMALL

SOLID

TERSE

TIGHT



6 Character Answers:

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LITTLE

TREATY



7 Character Answers:

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ENTENTE

SERRIED



8 Character Answers:

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ALLIANCE

SMALLISH



9 Character Answers:

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AGREEMENT



10 Character Answers:

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VESTPOCKET



15 Character Answers:

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FORMALAGREEMENT

MAKEUPCONTAINER

SMALLAUTOMOBILE