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Abroad, a kind of egg is not so nice (8)

Ross

I believe the answer is:

unkinder

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

'abroad a kind of egg' is the definition.
I can't tell whether this defines the answer.

'not so nice' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'so nice' becomes 'kinder' (I can't explain this - if you can you should give a lot more credence to this answer).
'un'+'kinder'='UNKINDER'

'is' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.
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