Leave after embracing new American sibling (5)

I believe the answer is:

quint

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

'sibling' is the definition.
(I know that quint is a type of sibling)

'leave after embracing new american' is the wordplay.
I cannot quite see how this works, but
'new' could be 'n' (common abbreviation eg NT for New Testament) and 'n' is present in the answer.
'leave' could be 'quit' (quitting is a kind of leaving) and 'quit' is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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