When this is done, you'll have flogged round empty vehicle (6)
I believe the answer is:
solved
'when this is done you'll' is the definition.
The definition suggests a singular noun but the answer is not.
'flogged round empty vehicle' is the wordplay.
'flogged' becomes 'sold' (I've seen this before).
'round' is an insertion indicator.
'empty' means to remove the middle letters.
'vehicle' with its centre removed is 've'.
'sold' placed around 've' is 'SOLVED'.
'have' acts as a link.
Can you help me to learn more?
(Other definitions for solved that I've seen before include "Figured out the clue" , "Puzzled out" , "Found a solution" , "Explained or answered, puzzle say" , "Explained or answered a mystery" .)