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All answers having "Show-off" as clue:

3 Character Answers:

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HAM

HOT



4 Character Answers:

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BRAG

HOTD



5 Character Answers:

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CUTUP

POSER



6 Character Answers:

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FLAUNT

HOTDOG

POSEUR

SMARTY



7 Character Answers:

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PARADER

PEACOCK

SPORTER



9 Character Answers:

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HOTDOGGER



12 Character Answers:

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GRANDSTANDER



13 Character Answers:

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EXHIBITIONIST