The most common and most likely answer to this crossword clue is the 7 letter word SHOCKED
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result SHOCKED
Buddy explains!

The straight part
We know that "Surprised" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case surprised = shocked.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 SHOCKED mean?
SHOCKED verb- To cause to be emotionally shocked, to cause (someone) to feel surprised and upset.
- To give an electric shock to.
- To meet with a shock; to collide in a violent encounter.
- To collect, or make up, into a shock or shocks; to stook.
- Surprised, startled, confused, or taken aback.
- Suffering from shock.