City on the Willamette (5)
I believe the answer is:
salem
'city on the willamette' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for salem that I've seen before include "state capital" , "trial scene" , "US witch-trial town" , "Place with allegedly wicked females" , "Capital of Oregon, USA" .)