Outstanding but still defeated (6)

I believe the answer is:

undone

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

'defeated' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for undone that I've seen before include "Ruined; not tied" , "Not finished; ruined" , "Ruined or dismantled" , "Brought to ruin or destruction - or not buttoned" , "Not finished; untied" .)

I've seen this clue in The Globe and Mail.

Want a hint initially instead of a full solution? Install my app