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All answers having "Accelerate" as clue:

3 Character Answers:

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AMP

GUN

REV



4 Character Answers:

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STEP



5 Character Answers:

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HURRY

REVUP

SPEED

UNITE



6 Character Answers:

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HASTEN

RIGOUR

STEPUP



7 Character Answers:

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QUICKEN

SPEEDUP



8 Character Answers:

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EXPEDITE



11 Character Answers:

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GATHERSPEED

PICKUPSPEED

PRECIPITATE



15 Character Answers:

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OPENTHETHROTTLE