Crossword Genius

What's excellent about politically conservative eccentric? (1,5,3)

Ross

I believe the answer is:

a right one

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

'what's excellent' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'about politically conservative eccentric?' is the wordplay.
I cannot really understand how this works, but
'about' could be 'on' and 'on' is located in the answer.
'conservative' could be 'right' ('right' can be similar in meaning to 'conservative') and 'right' is found in the answer.
The remaining letters 'ae' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.
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