Crossword Genius

Heavenly candidate, ultimately that woman in “non-party” colour (8)

Ross

I believe the answer is:

ethereal

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

'heavenly candidate ultimately that' is the definition.
'ethereal' can be an answer for 'heavenly' (I've seen this before). I'm unsure of the rest of the definition.

'woman in non-party colour' is the wordplay.
'woman' becomes 'Rea'.
'in' means one lot of letters goes inside another.
'non party colour' becomes 'ethel' (I can't explain this - if you can you should give a lot more credence to this answer).
'rea' put within 'ethel' is 'ETHEREAL'.

Can you help me to learn more?

(Other definitions for ethereal that I've seen before include "'Fairy-like, delicate (8)'" , "Light, delicate, insubstantial" , "Delicate - airy" , "Very delicate - tale here (anag)" , "Refined, airy" .)

I've seen this clue in the Sydney Morning Herald.
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