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All answers having "Marksman" as clue:

3 Character Answers:

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ACE



4 Character Answers:

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SHOT



5 Character Answers:

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AIMER



6 Character Answers:

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SNIPER



7 Character Answers:

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DEADEYE

SHOOTER



8 Character Answers:

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SURESHOT



9 Character Answers:

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CRACKSHOT

DEADEDICK



10 Character Answers:

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SHARPSHTER



11 Character Answers:

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DEADEYEDICK

WILLYBRANDT



12 Character Answers:

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SHARPSHOOTER