The most common and most likely answer to this crossword clue is the 4 plus 3 letter word RIOT ACT
I've seen this crossword clue in The Daily Telegraph
R
I
O
T
A
C
T
More clues leading to the result RIOT ACT
- Brazilian diplomacy in legislation delivered to the mob
- What might be read as warning to the mob?
- Right court for controlling scrap — thanks to this
- Old order to disperse rhino at intervals with sensitivity
- Dictator abandoning first desperate measure to keep order
- Stern warning in Olympic city provided with sensitivity
- Olympic diplomacy avoiding this being read?
- Uproar over performance? Read this
- Very little in Catholic teaching initially was read during troubles
- Concocting it, actor produces something read to little devils?
Buddy explains!
The straight part
We know that "Warning" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case warning = riot act.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.