Curiously Eve is chosen with son to show unity (12)

I believe the answer is:

cohesiveness

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'show unity' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

'curiously eve is chosen with son' is the wordplay.
'curiously' indicates an anagram.
'with' means one lot of letters goes inside another.
'son' becomes 's' (genealogical abbreviation for son).
'eve'+'is'+'chosen'='eveischosen'
'eveischosen' anagrammed gives 'coheiveness'.
'coheiveness' going around 's' is 'COHESIVENESS'.

'to' acts as a link.

Can you help me to learn more?

(Another definition for cohesiveness that I've seen is " Tendency to stick together".)

I've seen this clue in The Telegraph.

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