PC at first, young conservative goes into ownership (9)
I believe the answer is:
copyright
'ownership' is the definition.
'pc at first young conservative' is the wordplay.
'pc' becomes 'cop' (I've seen this in other clues).
'at' means one lot of letters go next to another.
'first young' becomes 'y' (1st letter of 'young').
'conservative' becomes 'right' (similar in meaning).
'cop'+'y'+'right'='COPYRIGHT'
'goes into' acts as a link.
(Other definitions for copyright that I've seen before include "Patent" , "Document granting exclusive right to publish" , "Sole entitlement to produce literary works" , "it gives one freedom to reproduce" , "property of the author?" .)