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All answers having "... think" as clue:

3 Character Answers:

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EWE

IAM



4 Character Answers:

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DEEM

FEEL

MULL

MUSE

TROW



5 Character Answers:

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GUESS

JUDGE

OPINE



6 Character Answers:

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IDEATE

ITOVER

PONDER

REASON



7 Character Answers:

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IMAGINE

REFLECT

SUPPOSE



8 Character Answers:

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COGITATE

CONSIDER

RUMINATE



11 Character Answers:

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LONGANDHARD

NOTHINGOFIT



13 Character Answers:

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OFTHECHILDREN

OUTSIDETHEBOX



15 Character Answers:

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USETHEOLDNOODLE