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All answers having "Constant" as clue:

4 Character Answers:

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EVEN

EVER

FIRM

TRUE



5 Character Answers:

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LOYAL

PERMA



6 Character Answers:

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STABLE

STATIC

STEADY



7 Character Answers:

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ABIDING

CHRONIC

EQUABLE

ETERNAL

NONSTOP

UNIFORM



9 Character Answers:

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CEASELESS

INCESSANT

INVARIANT

PERENNIAL

STEADFAST

UNCEASING



10 Character Answers:

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CHANGELESS