The most common and most likely answer to this crossword clue is the 11 letter word FLABBERGAST
I've seen this crossword clue in The Sunday Telegraph
F
L
A
B
B
E
R
G
A
S
T
More clues leading to the result FLABBERGAST
- Fat creature holding up first two on ground floor
- Fat pig eating starters of raw greens — wow!
- Workshop with British work unit occupying fixed floor
- “Fat” Alban canonised? Blow me down!
- Shock seeing fat animal eating every other bit of frog
- Shock, as fat brute eats starters of raw greens
- Surprise fat pig eating middle of burger
- Stun fat animal injecting drugs regularly
- Shocked as fat on bread gets spread
- Stun fat pig injecting drug occasionally
Buddy explains!

The straight part
We know that "Shocked" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shocked = flabbergast.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 FLABBERGAST mean?
FLABBERGAST noun- An awkward person.
- Overwhelming confusion, shock, or surprise.
- To overwhelm with bewilderment; to amaze, confound, or stun, especially in a ludicrous manner.