Crossword Genius

Weakened alien leaves without resolution (10)

Ross

I believe the answer is:

undermined

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

'weakened' is the definition.
('undermine' can be a synonym of 'weaken')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for undermined that I've seen is " Weakened".)

I've seen this clue in The Hindu.
Want a hint initially instead of a full solution? Install my app