Cryptic crossword clue
King careless concerning warning device 6

The most common and most likely answer to this crossword clue is the 6 letter word KLAXON

I've seen this crossword clue in The Daily Telegraph
K
L
A
X
O
N


Buddy explains!

The straight part
We know that "warning device" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case warning device = klaxon.
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 KLAXON mean?

KLAXON noun
  1. A loud electric alarm or horn.
KLAXON verb
  1. To produce a loud, siren-like wail.

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