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All answers having "Capital ___" as clue:

3 Character Answers:

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ONE



4 Character Answers:

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BAIN

GAIN

NEAT

OSLO

RARE

ROME

SANA

SEAT



5 Character Answers:

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GAINS

KABUL

MEANS

MONEY



6 Character Answers:

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ASSETS

ESTATE

TIPTOP



8 Character Answers:

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BRASILIA

BRUSSELS

CANBERRA

HELSINKI

KATMANDU

KINGSTON

NEWDELHI

SANTIAGO



9 Character Answers:

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EXCELLENT

FIRSTRATE

UPPERCASE



10 Character Answers:

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ADDISABABA

COPENHAGEN



15 Character Answers:

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UPPERCASELETTER