Stream into line formed behind navy (4,4)

I believe the answer is:

blue nile

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'stream' is the definition.

'line formed behind navy' is the wordplay.
'formed' is an anagram indicator.
'behind' is a charade indicator (letters next to each other).
'navy' becomes 'blue' (I am not sure about this - if you are sure you should believe this answer much more).
'line' anagrammed gives 'nile'.
'nile' after 'blue' is 'BLUE NILE'.

'into' is the link.

Can you help me to learn more?

(Other definitions for blue nile that I've seen before include "African river" , "There's also a white river" , "River flowing from Lake Tana (Ethiopia) to Khartoum (Sudan)" .)

I've seen this clue in the Sydney Morning Herald.

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