Really good to be done (11)
I believe the answer is:
outstanding
'really good' is the definition.
'outstanding' can be an answer for 'good' (thesaurus). I'm not certain of the 'really' bit.
'be done' is the wordplay.
I cannot really understand how this works, but
'be' could be 'stand' (standing is a kind of being) and 'stand' is found within the answer.
'done' could be 'u' and 'u' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for outstanding that I've seen before include "Great" , "unsettled" , "superior" , "Exceptionally good" , "to be settled" .)