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All answers having "Obsession" as clue:

3 Character Answers:

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BUG

TIC

XIA



5 Character Answers:

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MANIA

SCENT



6 Character Answers:

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FETISH

PHOBIA



7 Character Answers:

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COLOGNE



8 Character Answers:

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FIXATION

IDEEFIXE



9 Character Answers:

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FIXEDIDEA

MONOMANIA



14 Character Answers:

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BEEINTHEBONNET



15 Character Answers:

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BEEINONESBONNET