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All answers having "In addition" as clue:

3 Character Answers:

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AMS

AND

TOO

YET



4 Character Answers:

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ALSO

ELSE

MARK

MORE

PLUS

THEN



5 Character Answers:

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AGAIN

ALONG

EXTRA

GEESE

WORDS



6 Character Answers:

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ASWELL

ATTHAT

NOLESS

REMOTE

TOBOOT

WITHAL



7 Character Answers:

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ANOMALY

BESIDES

BUTALSO

EMERALD

FURTHER

SANDBAG



8 Character Answers:

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ASABONUS

ASSISTED

MOREOVER

SECONDLY

VILLAINS



9 Character Answers:

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AEROPLANE

BANKDRAFT

DUNEBUGGY



11 Character Answers:

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FURTHERMORE

POINTILLISM