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All answers having "Pep" as clue:

3 Character Answers:

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VIM

ZIP



4 Character Answers:

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BRIO

ELAN

SNAP

ZEAL

ZEST

ZING



5 Character Answers:

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MOXIE

OOMPH

RALLY

VERVE

VIGOR



6 Character Answers:

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BOUNCE

ENERGY

GINGER



10 Character Answers:

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GETUPANDGO



11 Character Answers:

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VIMANDVIGOR



12 Character Answers:

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LIVELYENERGY