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All answers having "Lacking" as clue:

3 Character Answers:

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RHO

SHY



4 Character Answers:

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LESS

SANS



5 Character Answers:

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MINUS

NEEDY

OUTOF

SHORT



6 Character Answers:

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ABSENT

BAREOF

BEREFT

DEVOID

FREEOF

INNEED

INWANT

NEEDED

VOIDOF



7 Character Answers:

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SHORTOF

WITHOUT



8 Character Answers:

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DEVOIDOF

INNEEDOF

INWANTOF



9 Character Answers:

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DEFICIENT

SPINELESS



10 Character Answers:

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INADEQUATE



11 Character Answers:

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UNQUALIFIED



12 Character Answers:

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INSUFFICIENT



13 Character Answers:

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WITHOUTATRACY