### Clue: One confined by banks depressed about reversal of policy (4,4)
### Answer: BLUE NILE 
 ### Explanation: Definition: One confined by banks
 BLUE(feeling depressed/sad) **containing**(about) **reversal of**(reversal of) LINE(policy/a prescribed course of action or behaviour, as in "toe the line or get fired").
Defn: …, ie. a river between its bank; this one is in Africa.
… not so confined in some parts of its journey.