clear and present danger is a noun meaning "a standard for judging when freedom of speech can be abridged". It carries one recorded sense.
a standard for judging when freedom of speech can be abridged
“no one has a right to shout `fire' in a crowded theater when there is no fire because such an action would pose a clear and present danger to public safety”
Definitions, synonyms and semantic relations for clear and present danger come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.
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