Crossword Genius

Worthless bunch or individual engaged in demonstrating? (6)

Ross

I believe the answer is:

shower

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'worthless bunch' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for shower that I've seen before include "an awful lot" , "Washing facility - worthless lot" , "One who points out" , "Brief rainfall" , "awful group of people" .)

I've seen this clue in The Times.
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