The most common and most likely answer to this crossword clue is the 11 letter word THREATENING
I've seen this crossword clue in Financial Times
T
H
R
E
A
T
E
N
I
N
G
More clues leading to the result THREATENING
- Her ten giant blunders constituting a menace
- Dangerous matter admitting last drop of liquor swallowed
- Ominous obsession surrounding soldiers with neat display
- Her neat gin fizzes laced with smallest splash of tonic — ominous!
- Queen Vic hen night tear shed — that’s ominous
- Ominous review of rent and heating
- Ominous phobia about a number’s admitted
- Ominous entity swallowing redhead, devoured
Buddy explains!
The straight part
We know that "Dangerous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dangerous = threatening.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 THREATENING mean?
THREATENING verb- To make a threat against someone; to use threats.
- To menace, or be dangerous.
- To portend, or give a warning of.
- To be close to equaling or surpassing (a record, etc.)
- An act of threatening; a threat.
- Presenting a threat; menacing; frightening.