Get zany characters jumping into river (7)
I believe the answer is:
yangtze
'river' is the definition.
(I know that Yangtze is a river)
'get zany characters' is the wordplay.
'characters' indicates anagramming the letters.
'get'+'zany'='getzany'
'getzany' with letters rearranged gives 'YANGTZE'.
'jumping into' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for yangtze that I've seen before include "River in China; get zany (anag.)" , "Chinese river; Tyne zag (anag.)" , "China's longest river now known as Chang Jiang" , "China's main river" , "Chinese river; get zany (anag.)" .)