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All answers having "Flag" as clue:

3 Character Answers:

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EBB

IMP

RHO

SAG



4 Character Answers:

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DAYS

FADE

HAIL

IRIS

JACK

SHIP

SLAB

TIRE

WANE

WILT



5 Character Answers:

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ALERT

DROOP

RABBI



6 Character Answers:

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AGENDA

BANNER

COLORS

ENSIGN

PENNON

SIGNAL

WEAKEN



7 Character Answers:

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CANAPES

DIEDOWN

FATIGUE

KARACHI

PENNANT



8 Character Answers:

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BRUSSELS

GONFALON

LANGUISH

NEEDANAP

STANDARD

STREAMER



9 Character Answers:

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LOSESTEAM



10 Character Answers:

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LOSESPIRIT



13 Character Answers:

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RUNOUTOFSTEAM



15 Character Answers:

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STARSANDSTRIPES