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All answers having "Begin" as clue:

3 Character Answers:

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SET

TEE



4 Character Answers:

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OPEN

RISE

SOUT



5 Character Answers:

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ARISE

EMBED

ENTER

EXULT

ICING

SETIN

SETTO

START

STOUT



6 Character Answers:

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ARISES

FALLTO

GOTOIT

INCEPT

OPENUP

REMAIN

SETOUT

TAKEUP

TEEOFF

TURNTO



7 Character Answers:

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DISPUTE

ENTERON

GETITON

ISRAELI

KICKOFF

LEADOFF

ODDMENT

PREFACE

STARTIN

STARTON

STARTUP



8 Character Answers:

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COMMENCE

CONTRARY

GETGOING

INITIATE

SETABOUT

STARTOFF

STARTOUT

STRIKEUP

WADEINTO



9 Character Answers:

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BEEFEATER

GERMINATE

ORIGINATE

SETTOWORK



10 Character Answers:

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INAUGURATE

STARTOFFON



11 Character Answers:

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ASTONISHING

GETCRACKING

OPERATIONAL



13 Character Answers:

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PEACENOBELIST