Reclusive industrialist, speaking for the Greens, perhaps (4)

I believe the answer is:

hues

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'greens perhaps' is the definition.
The answer and definition can be both related to change as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for hues that I've seen before include "Colours" , "Tones or shades" .)

I've seen this clue in The Times.

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