Exciting experience coming on N Yorks river (9)
I believe the answer is:
'exciting experience' is the definition.
(I've seen this in another clue)
'coming on n yorks river' is the wordplay.
I cannot really see how this works, but
'coming' could be 'advent' (advent is the arrival or coming of something) and 'advent' is present in the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is located in the answer.
A single letter 'u' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for adventure that I've seen before include "spirit of enterprise" , "Hazardous operation" , "Risky or exciting experience" , "speculation" , "Exciting series of events" .)