Touched Zero° F? (5)
I believe the answer is:
froze
'touched' is the definition.
The answer and definition can be both related to change as well as being past participle verbs.
Perhaps there's an association between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for froze that I've seen before include "suddenly stopped" , "Became iced over" , "Suddenly stood motionless" , "Stopped dead" , "Didn't move" .)