Not yet dealt with case of larceny? Very well (13)
I believe the answer is:
outstandingly
'well' is the definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?
'not yet dealt with case of larceny?' is the wordplay.
I cannot really see how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'with' could be 'and' and 'and' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'very' is the link.
Can you help me to learn more?
(Other definitions for outstandingly that I've seen before include "Exceptionally well" , "Remarkably" .)