Crossword Genius

Old tidal wave eliminating river reed (4)

Ross

I believe the answer is:

oboe

I'm a little stuck... Click here to teach me more about this clue!

'reed' is the definition.
(oboe is a kind of reed)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for oboe that I've seen before include "Player" , "Woodwind instrument of treble pitch" , "Double-reed woodwind" , "Double-reed wind instrument" , "Instrument used in 1d" .)

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