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All answers having "Gist" as clue:

3 Character Answers:

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NUB

NUT

SUM



4 Character Answers:

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CORE

CRUX

IDEA

MEAT

PITH



5 Character Answers:

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HEART

POINT

SENSE

TENOR

THEME



6 Character Answers:

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KERNEL

RETINA

THRUST

UPSHOT



7 Character Answers:

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ESSENCE

PURPORT



8 Character Answers:

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GENDARME

MAINIDEA

SUMTOTAL



9 Character Answers:

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MERCENARY

ROUGHIDEA



15 Character Answers:

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HEARTOFTHEISSUE

SUMANDSUBSTANCE

THELONGANDSHORT