The most common and most likely answer to this crossword clue is the 5 letter word BLEEP
B
L
E
E
P
More clues leading to the result BLEEP
- High-pitched sound initially bewildering retired PM
- British PM raised alert
- High-pitched sound, line breaking audible signal
- One may remove bad language from feeble episode
- Electronic noise from bass getting radio DJ upset
- Censor almost ruined recording
- Signal made by British PM heading west
- TV’s curse? Left during live recording
- Sound way to remove bad language
- The sound of swearing on TV
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 = bleep.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.
What does BLEEP mean?
BLEEP noun- A brief high-pitched sound, as from some electronic device.
- Something named by an explicit noun in the original, unedited version of the containing sentence.
- A broad genre of electronic music with goth and industrial influences, as opposed to traditional gothic rock.
- To emit one or more bleeps.
- To edit out inappropriate spoken language in a broadcast by replacing offending words with bleeps.