Gets to parts of the river (7)
I believe the answer is:
reaches
This might be a double definition.
'gets to' is the first definition.
(I've seen this in another clue)
'parts of the river' is the second definition.
'reaches' can be an answer for 'parts' (reach is a kind of part). I am not certain of the 'of the river' bit.
Can you help me to learn more?
(Other definitions for reaches that I've seen before include "Arrives at" , "Gets to" , "Succeeds in achieving" , "Comes to" , "River stretches between bends" .)