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All answers having "Permanent" as clue:

4 Character Answers:

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WAVE



5 Character Answers:

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FIXED

INKED

STAID



6 Character Answers:

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STABLE



7 Character Answers:

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ABIDING

ALLTIME

LASTING



8 Character Answers:

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COLDWAVE

ENDURING



9 Character Answers:

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IMMUTABLE

INDELIBLE



10 Character Answers:

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HERETOSTAY

SETINSTONE



12 Character Answers:

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IRREVERSIBLE



14 Character Answers:

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WRITTENINSTONE