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All answers having "Veteran" as clue:

3 Character Answers:

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OLD

PRO



4 Character Answers:

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EXGI

OLDH



6 Character Answers:

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OLDPRO

STAGER



7 Character Answers:

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HONOREE

OLDHAND

OLDSTER

OLDTIME



8 Character Answers:

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OLDTIMER

SEASONED



12 Character Answers:

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EXSERVICEMAN