The most common and most likely answer to this crossword clue is the 9 letter word THRILLING
I've seen this crossword clue in Financial Times
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More clues leading to the result THRILLING
- Exciting object straddling stream
- Exciting hour in allotment work
- Object to nurse running water, getting you worked up
- Exciting fact about flowing water
- Sensational fact about stream
- Article about Brook is riveting
- Gripping device holds stream
- Soul-stirring singing around hospital
- Fascinating article about small flower
- Exciting affair holds the seed of reckless wickedness
Buddy explains!

The straight part
We know that "Fascinating" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fascinating = thrilling.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 THRILLING mean?
THRILLING verb- To suddenly excite someone, or to give someone great pleasure; to (figuratively) electrify; to experience such a sensation.
- To (cause something to) tremble or quiver.
- To perforate by a pointed instrument; to bore; to transfix; to drill.
- To hurl; to throw; to cast.
- To drill and thread in one operation, using a tool bit that cuts the hole and the threads in one series of computer-controlled movements.
- A thrill.
- Causing a feeling of sudden excitement.