It indicates you’ll give generously (6)

I believe the answer is:

shower

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'give generously' is the definition.
('shower' can be a synonym of 'give generously')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for shower that I've seen before include "clean" , "that's revealing?" , "Brief rainfall" , "awful group of people" , "One exhibiting" .)

I've seen this clue in the Evening Standard.

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