Oregon's largest city (8)
I believe the answer is:
portland
'oregon's largest city' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for portland that I've seen before include "Dorset source of fine limestone" , "Bill is here" , "Shipping forecast area between Plymouth and Wight" , "west coast city" , "Dorset peninsula with limestone quarries" .)