Crossword Genius

To cook, traps rain water (6)

Ross

I believe the answer is:

stream

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'water' is the definition.
(I know that stream is a type of water)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stream that I've seen before include "Quantity of water" , "Flock" , "Running liquid" , "pupils pour out" , "'Current, flow (6)'" .)

I've seen this clue in the Evening Standard.
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