Entice everyone onto river at Ripon (6)
I believe the answer is:
allure
'entice' is the definition.
(thesaurus)
'everyone onto river at ripon' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'onto' is a charade indicator (letters next to each other).
'river at ripon' becomes 'ure' (I've seen this before).
'all'+'ure'='ALLURE'
(Other definitions for allure that I've seen before include "There's glamour" , "Entice or attract - sounds like a decoy" , "Attraction, appeal" , "Entice; appeal" , "Powerful fascination" .)