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All answers having "Interminable" as clue:

3 Character Answers:

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KIT



4 Character Answers:

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LONG



5 Character Answers:

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ONEND

POSER



6 Character Answers:

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SERVED



7 Character Answers:

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ABANDON

AGELONG

ENDLESS

ETERNAL

NOENDTO

NONSTOP



8 Character Answers:

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TIMELESS



9 Character Answers:

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CEASELESS

SPEEDEDUP



10 Character Answers:

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OVERBURDEN



11 Character Answers:

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NEVERENDING



13 Character Answers:

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ROUNDTHECLOCK