Amazon, for one (5)

There are a few possibilities for this:

Which length description are you looking for?:

1,6

river

'amazon for one' is the definition.
(amazon is a kind of river)

This is all the clue.

(Other definitions for river that I've seen before include "x or y, so to speak" , "Current" , "Eg, Severn" , "flower" , "eg Aire" .)

I've seen this clue in the King Feature Syndicate.

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