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All answers having "Opinion" as clue:

3 Character Answers:

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SAY



4 Character Answers:

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DOXY

EYES

IDEA

MIND

POLL

TAKE

VIEW



5 Character Answers:

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INPUT

SLANT

TENET

VOICE



6 Character Answers:

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ADVICE

BELIEF



7 Character Answers:

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KEYHOLE



8 Character Answers:

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ESTIMATE

TWOCENTS



9 Character Answers:

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SENTIMENT



10 Character Answers:

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ESTIMATION

STANDPOINT



11 Character Answers:

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POINTOFVIEW



15 Character Answers:

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MYONECENTSWORTH

SCHOOLOFTHOUGHT