Spear, article Indonesian discards before river rises (7)

I believe the answer is:

javelin

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'spear' is the definition.
(javelin is a kind of spear)

I don't understand the rest of the clue.

(Other definitions for javelin that I've seen before include "Type of spear" , "It's thrown in a field event" , "Field event missile" , "Sporting spear" , "Sporting missile" .)

I've seen this clue in The Telegraph.

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