I think a theme word hinted at by the title/preamble is being used cryptically and, if so, all of the unclued entries would be reasonable synonyms of the first 5 letters of this 9 letter word.
However, the 9 letter word itself isn't exactly synonymous with 'warning' - it's defined as 'a password... a signal' etc (although 'signal' can mean 'danger' according to Chambers) so it's not ideal - maybe there's a better '?????word'?