The most common and most likely answer to this crossword clue is the 9 letter word TRAUMATIC
I've seen this crossword clue in The Daily Telegraph
T
R
A
U
M
A
T
I
C
More clues leading to the result TRAUMATIC
- Shocking weapon to put out by extremities of tower
- Shocking start for uncle in vehicle — Greek, reportedly
- A jerk on vehicle carrying you, reportedly painful
- Disturbing and not quite mature to be larking about at ninety-nine
- Shocking hoax almost secures gold rug
- Shocking art movement has a following — I’m not sure about it on reflection
- Tangle in new haircut after husband leaves is upsetting
- Painful time and tense when daughter leaves to tour university
- Emotionally shocking art reviewed with hesitation — a reflex reaction
- Distressing illusion, mostly about gold rug
Buddy explains!

The straight part
We know that "Emotionally shocking" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case emotionally shocking = traumatic.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 TRAUMATIC mean?
TRAUMATIC adjective- Of, caused by, or causing trauma.
- Of or relating to wounds; applied to wounds.
- Adapted to the cure of wounds; vulnerary.
- Produced by wounds.
- A medicine for wounds; a vulnerary.