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All answers having "Keep" as clue:

3 Character Answers:

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HAS

OWN



4 Character Answers:

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ATIT

HAVE

HERD

HOLD

ITLL

LAST

SAVE

STAY

STOW

TEND



5 Character Answers:

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BOARD

GUARD

STORE



6 Character Answers:

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CASTLE

DETAIN

DONJON

ENCAGE

HOLDTO

INMIND

RETAIN



7 Character Answers:

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DUNGEON

LEAVEIN

TEAROUT



8 Character Answers:

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FORTRESS

HANGONTO

HOLDONTO

MAINTAIN

PRESERVE

WITHHOLD



10 Character Answers:

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STRONGHOLD



14 Character Answers:

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TAKEAQUICKLOOK