Crossword Genius

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

Ross

I believe the answer is:

organ

I'm a little stuck... Click here to teach me about this clue!

Here is my best explanation:

'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?

This clue was last seen in Evening Standard