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All answers having "Frank" as clue:

3 Character Answers:

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DOG

RHO



4 Character Answers:

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ANNE

CAID

OPEN



5 Character Answers:

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CAPRA

FOURS

ZAPPA



6 Character Answers:

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CANDID

DETACH

DIRECT

HONEST

HOTDOG

REDHOT

WEENIE

WIENER

WIENIE



7 Character Answers:

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DIARIST

NUANCED

SINCERE

UPFRONT



8 Character Answers:

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MANTOMAN



9 Character Answers:

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OUTSPOKEN

TUBESTEAK



10 Character Answers:

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FORTHRIGHT

FOURSQUARE

FREESPOKEN



11 Character Answers:

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PLAINSPOKEN

UNDISGUISED



12 Character Answers:

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HEARTTOHEART



15 Character Answers:

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HAIRLESSRATPACK