Journalist slang: the paragraph (see graf) that contains the gist of the news story. Also nut graf. Example: So the lead paragraph of a story became lede, paragraphs in general became grafs, and the graf explaining the basics of the story was called the nut graf. From Ken Layne's warblog.
NUT-GRAF
Meaning of NUT-GRAF in English
Slang English vocab. Английский сленговый словарь. 2012