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All answers having "Additional" as clue:

3 Character Answers:

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ADO

BOW

ELL

ILL

LET



4 Character Answers:

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ALSO

ELSE

EPIC

ERSE

MORE

PLUS

RUNG

XTRA

YAWN



5 Character Answers:

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DWELL

ENTER

EXTRA

HACKS

HYDRA

IDEAL

IDLED

JOINT

KNOUT

ONSET

OTHER

SHOES

SPARE

SUAVE

TASTE

TEMPT

TITHE

TRAMP

USUAL



6 Character Answers:

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COUGAR

EXCISE

FOURTH

HOARSE

OTHERS

SAVAGE

SECOND

SUBDUE



7 Character Answers:

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ACCLAIM

ANOTHER

CUMULUS

DEIGNED

ENTITLE

NEMESIS

OCTAGON

OFFENCE



8 Character Answers:

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MAGNOLIA

RESTRAIN

SOMEMORE



9 Character Answers:

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NEGLECTED

SCRUMHALF



11 Character Answers:

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AERONAUTICS

CENTENARIAN

HAIRSTYLIST

SITTINGROOM



12 Character Answers:

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APIECEOFCAKE

SUPPLEMENTAL



13 Character Answers:

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AUTHORITATIVE

SUPPLEMENTARY