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All answers having "Green light" as clue:

3 Character Answers:

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AOK

NOD

OKE

YES



4 Character Answers:

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OKAY



6 Character Answers:

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ASSENT

GOSIGN



7 Character Answers:

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APPROVE

GOAHEAD



8 Character Answers:

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THUMBSUP



9 Character Answers:

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CLEARANCE

OSCARKILO

SOLARLAMP



14 Character Answers:

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SEALOFAPPROVAL



15 Character Answers:

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STAMPOFAPPROVAL