The most common and most likely answer to this crossword clue is the 6 letter word AMAZED
I've seen this crossword clue in The Sunday Telegraph
A
M
A
Z
E
D
More clues leading to the result AMAZED
- Notice surrounding layout of hedges, staggered
- Very surprised these days to go round part of Hampton Court gardens
- Complex system in Saudi regularly defied understanding
- Bill touring Long Kesh, gobsmacked
- Stunned in the morning by Observer crossword
- Floored by publicity about puzzle
- Surprised river’s bypassed on vacation in England
- Astonished to get a degree with mark as far removed from A as possible
- A jungle with diamonds gets knocked for six
- … floored by tangle inside plug
Buddy explains!

The straight part
We know that "bowled over" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bowled over = amazed.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 AMAZED mean?
AMAZED verb- To fill with wonder and surprise; to astonish, astound, surprise or perplex.
- To undergo amazement; to be astounded.
- To stupefy; to knock unconscious.
- To bewilder; to stupefy; to bring into a maze.
- To terrify, to fill with panic.
- Astonished; confounded with fear, surprise, or wonder; greatly surprised. The following adposition may be: at, with or by.