Wanderer's arrival by one river, then another (10)
I believe the answer is:
adventurer
'wanderer's' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'arrival by one river then another' is the wordplay.
'arrival' becomes 'advent' (advent is a kind of arrival).
'by one river then' becomes 'ure' (I can't justify this - if you can you should give a lot more credence to this answer).
'another' becomes 'r' (I've seen this in other clues).
'advent'+'ure'+'r'='ADVENTURER'
Can you help me to learn more?
(Other definitions for adventurer that I've seen before include "One seeking exciting experiences" , "Daredevil" , "One off in search of exciting experiences" , "One loving dangerous exploits" , "one to take risks" .)