Crossword Genius

Unreasonably and nefariously abandoned store, now and then, being quite rebellious (8)

Ross

I believe the answer is:

unfairly

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

'unreasonably' is the definition.
Both the answer and definition are adverbs. Maybe they are linked in a way I don't understand?

'and nefariously abandoned store now and then being quite rebellious' is the wordplay.
I cannot quite understand how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'quite' could be 'fairly' (I've seen this before) and 'fairly' is present in the answer.
A single letter 'u' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for unfairly that I've seen before include "Inequitably, wrongly" , "dishonestly" , "Unjustly" , "Without justice" .)

I've seen this clue in The Irish Times.
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