Strong woman of the river (6)
I believe the answer is:
amazon
This clue is a double definition.
'strong woman' is the first definition.
(I've seen this before)
'the river' is the second definition.
(Amazon is an example)
'of' is the link.
(Other definitions for amazon that I've seen before include "Female warrior - parrot - South American river" , "River in South America" , "One of a mythic nation of women warriors" , "Brazilian river" , "banker" .)