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All answers having "Purpose" as clue:

3 Character Answers:

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AIM

END

RHO

USE



4 Character Answers:

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DUAL

GOAL

MEAN

ROLE

SAKE

TONO



5 Character Answers:

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AVAIL

CAUSE

POINT

SENSE

STEAD

YIELD



6 Character Answers:

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DESIGN

ENDUSE

INTENT

MOTIVE

OBJECT

REASON

SPOUSE



8 Character Answers:

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HUMOURED

STUDIOUS



9 Character Answers:

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INTENTION

OBJECTIVE



11 Character Answers:

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RAISONDETRE