Port not touched (4)
I believe the answer is:
left
This clue could be a double definition.
'port' is the first definition.
(port is the left side on a boat)
'not touched' is the second definition.
The answer and definition can be both related to change as well as being past participle verbs.
Perhaps you can see a link between them that I don't see?
Can you help me to learn more?
(Other definitions for left that I've seen before include "Departed, went away" , "The side of socialism" , "set out" , "Facing north, it's the side toward the west" , "Outstanding" .)