A red nose, perhaps, can never quite be orange (5)

I believe the answer is:

organ

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'a red nose' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for organ that I've seen before include "specialist magazine" , "House journal" , "Publication - musical instrument" , "Wurlitzer, for example" , "Part with special function" .)

I've seen this clue in the Evening Standard.

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