Washington seaport (6)
'washington seaport' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tacoma that I've seen before include "US city" , "Port city in Washington" .)
(Other definitions for seattle that I've seen before include "Place in Washington" , "city in north-west America" , "US West coast port" , "? American seaport" , "Port of north-west USA" .)