Fascinated by second hand (12)
I believe the answer is:
prepossessed
'fascinated' is the definition.
The answer and definition can be both to do with human feelings as well as being past participle verbs.
Perhaps you can see a link between them that I don't see?
'second hand' is the wordplay.
I cannot really see how this works, but
'second' could be 're' (prefix meaning second in eg review, re-education) and 're' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'by' acts as a link.
(Other definitions for prepossessed that I've seen before include "Having mind set on something" , "Worried" .)