Crossword Genius

One with colourful political ideas? (3)

Ross

I believe the answer is:

red

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This could be a double definition.

'one' is the first definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I can't see?

'with colourful political ideas?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

Can you help me to learn more?

(Other definitions for red that I've seen before include "Colour of blood" , "Left-wing" , "Bloodshot" , "could be a Marxist" , "Glowing" .)

I've seen this clue in the Evening Standard.
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