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All answers having "Hairdo" as clue:

3 Character Answers:

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BOB

BUN

SET



4 Character Answers:

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AFRO

BANG

COIF

PERM



5 Character Answers:

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BANGS

BRAID

STYLE



6 Character Answers:

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BRAIDS



7 Character Answers:

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PAGEBOY

PIGTAIL



8 Character Answers:

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COIFFURE

PONYTAIL

RINGLETS

SPITCURL



9 Character Answers:

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PERMANENT