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All answers having "Pinpoint" as clue:

3 Character Answers:

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DOT



4 Character Answers:

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LOCE

NAIL

NAME

SPOT



5 Character Answers:

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FOCUS



6 Character Answers:

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HOMEIN

LOCATE



7 Character Answers:

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ISOLATE



8 Character Answers:

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IDENTIFY

ZEROINON



15 Character Answers:

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PUTONESFINGERON