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All answers having "No matter what" as clue:

5 Character Answers:

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WHICH



6 Character Answers:

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ANYWAY



7 Character Answers:

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AVERTED



9 Character Answers:

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ATANPRICE

ATANYCOST

INANYCASE



10 Character Answers:

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ATALLCOSTS

ATANYPRICE

INANYEVENT



13 Character Answers:

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INGOODTANDBAD



15 Character Answers:

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BYHOOKORBYCROOK

COMERAINORSHINE

ONEWAYORANOTHER