Female warrior in river (6)
I believe the answer is:
amazon
I believe this is a double definition.
'female warrior' is the first definition.
(I've seen this before)
'river' is the second definition.
(Amazon is an example)
'in' is the link.
(Other definitions for amazon that I've seen before include "Legendary woman warrior and river" , "World's largest river" , "Awesome female" , "Encourage, ask" , "seller on the Internet" .)