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All answers having "Troublesome" as clue:

3 Character Answers:

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BAD



4 Character Answers:

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HARD



5 Character Answers:

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ONERY

PESKY

PESTY

SPINY



6 Character Answers:

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KNOTTY

STICKY

VEXING



7 Character Answers:

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ONEROUS



8 Character Answers:

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HARRYING

WORRYING



9 Character Answers:

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UPSETTING

VEXATIOUS



12 Character Answers:

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INCONVENIENT