City transit protector's back half not opening when twisted (7)
I believe the answer is:
seattle
'city' is the definition.
(Seattle is an example)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for seattle that I've seen before include "coastal city" , "City of north-west USA" , "U S west coast city" , "? American seaport" , "Let's eat at this US city" .)