Peaceful character left port unfinished (4)
I believe the answer is:
dove
'peaceful character left' is the definition.
The definition and answer can be both to do with motion as well as being past participle verbs.
Perhaps you can see an association between them that I can't see?
'port unfinished' is the wordplay.
'port' becomes 'dover' (I've seen this before).
'unfinished' means to remove the last letter.
'dover' with its final letter removed is 'DOVE'.
Can you help me to learn more?
(Other definitions for dove that I've seen before include "Bird in the pigeon family" , "Bird representing peace" , "plunged in the Grand Canyon" , "Cooing bird" , "Bird; advocate of peace" .)