The most common and most likely answer to this crossword clue is the 9 letter word PHENOMENA
I've seen this crossword clue in The Guardian
P
H
E
N
O
M
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A
More clues leading to the result PHENOMENA
- Remarkable events in empty patch with flower springing up
- They happen to see father embracing females only, zero males
- Amazing things — height seen during revolutionary flower power
- Wonders of flower returned by gutted pharaoh
- Catastrophe! No men allowed to host these amazing events
- Climbing plant starts to hatch, passer-by marvels
- Man with new sign enters annually and marvels
- Flower power on reflection stopped by hard facts
- Remarkable things of prophetic significance seen by female in Pennsylvania
- Heads of physics turned sea creature into remarkable things
Buddy explains!

The straight part
We know that "wonders" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wonders = phenomena.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 PHENOMENA mean?
PHENOMENA noun- A thing or being, event or process, perceptible through senses; or a fact or occurrence thereof.
- (by extension) A knowable thing or event (eg by inference, especially in science)
- A kind or type of phenomenon (sense 1 or 2)
- Appearance; a perceptible aspect of something that is mutable.
- A fact or event considered very unusual, curious, or astonishing by those who witness it.
- A wonderful or very remarkable person or thing.
- (chiefly Kantian idealism) An experienced object whose constitution reflects the order and conceptual structure imposed upon it by the human mind (especially by the powers of perception and understanding).