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All answers having "Alert" as clue:

3 Character Answers:

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APB

RED

RHO



4 Character Answers:

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ATIP

BALL

KEEN

NERD

PING

SMOG

WARN

WARY



5 Character Answers:

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ALARM

AWAKE

AWARE

EMAIL

READY

WOKEN



6 Character Answers:

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INFORM

TIPOFF



7 Character Answers:

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ATIPTOE

HEADSUP

ONGUARD

QUIVIVE

REDFLAG

WAKEFUL



8 Character Answers:

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ONTHEJOB

ONTIPTOE

OPENEYED



9 Character Answers:

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ONTHEBALL

WIDEAWAKE



10 Character Answers:

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ONONESTOES



12 Character Answers:

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ONTHEQUIVIVE