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All answers having "Initially" as clue:

3 Character Answers:

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CSA

OMG

WTF

YSL



4 Character Answers:

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ACHE

BARE

CURT

FEAT

FOCI

SLAP

TALC



5 Character Answers:

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FIRST



7 Character Answers:

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ATFIRST

EARLYON

TOSTART



8 Character Answers:

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REGISTER



10 Character Answers:

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ATTHESTART

FIRSTBLUSH



12 Character Answers:

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ATFIRSTBLUSH



15 Character Answers:

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INTHEFIRSTPLACE