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All answers having "First-class" as clue:

3 Character Answers:

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ACE



4 Character Answers:

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AONE

TOPS



5 Character Answers:

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BRILL

ELITE

PRIMO



6 Character Answers:

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CHOICE

DELUXE

GRADEA

RATEDA

TIPTOP

TOPEND



7 Character Answers:

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TOPTIER



8 Character Answers:

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FIVESTAR

STERLING



9 Character Answers:

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GILTEDGED

TOPDRAWER