Crossword Genius

Didn't excavate enough to be sabotaged? (10)

Ross

I believe the answer is:

undermined

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

'sabotaged?' is the definition.
('undermine' can be a synonym of 'sabotage')

'didn't excavate enough' is the wordplay.
I cannot really understand how this works, but
'excavate' could be 'mine' and 'mine' is found in the answer.
This explanation may well be incorrect...

'to be' acts as a link.

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.
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