An additional edition of a newspaper (usually to report a crisis) WordNet 3.0 & Open English WordNet

A newspaper extra, extra edition, special edition, or simply extra is a special issue of a newspaper issued outside the normal publishing schedule to report on important or sensational news which arrived too late for the regular edition, such as the outbreak of war, the assassination of a public figure, or even latest developments in a sensational trial. Wikipedia

A supplemental issue Wikipedia Disambiguation

A special issue of a newspaper, advertised with the shout ""Extra! Extra! Read all about it!", which became a catchphrase Wikipedia Disambiguation

Special issue of a newspaper Wikidata

An extra edition of a newspaper, which is printed outside of the normal printing cycle. Wiktionary

Extra edition of a newspaper. Wiktionary (translation)