Ownership in advance is very attractive (13)
I believe the answer is:
prepossessing
'attractive' is the definition.
(similar in meaning)
'ownership in advance is' is the wordplay.
I cannot really understand how this works, but
'in' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'very' acts as a link.
Can you help me to learn more?
(Other definitions for prepossessing that I've seen before include "looking good" , "Attractive" , "winning" , "Fetching" .)