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All answers having "Starting point" as clue:

3 Character Answers:

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EGG

ONE

TEE



4 Character Answers:

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BASE

EDEN

GERM

IDEA

SEED

WOMB

ZERO



5 Character Answers:

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BASIS

BIRTH

GETGO

GITGO

ONSET



6 Character Answers:

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ORIGIN

OUTSET



7 Character Answers:

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PAGEONE

STEPONE



8 Character Answers:

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ONBUTTON



9 Character Answers:

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SQUAREONE



15 Character Answers:

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JUMPINGOFFPLACE