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All answers having "Overjoyed" as clue:

3 Character Answers:

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VEX



4 Character Answers:

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GLAD

HEAP



5 Character Answers:

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ELATE



6 Character Answers:

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ELATED

YEARLY



7 Character Answers:

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AUSTERE

MANACLE

PLEASED

RISOTTO

SCARVES



8 Character Answers:

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AQUALUNG

ECSTATIC

JUBILANT



9 Character Answers:

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COCKAHOOP

DELIGHTED

EXUBERANT

INECSTASY

RHAPSODIC



12 Character Answers:

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HAPPYASALARK