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All answers having "Prime ___" as clue:

3 Character Answers:

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GET

RIB



4 Character Answers:

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AONE

BEST

MAIN

PEAK

RATE

TIME

USDA



5 Character Answers:

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ELECT

FIRST

READY



6 Character Answers:

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CHOICE

CLASSA

GRADEA

HEYDAY

INONES

SELECT



7 Character Answers:

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CENTRAL

GLIMPSE



8 Character Answers:

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CARDINAL

IMMUNITY

MERIDIAN



9 Character Answers:

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MINISTERS