Wash. is west of it (3)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
ida
(Other definitions for ida that I've seen before include "- Rubinstein, Russian dancer, actress" , "The girl for Dai" , "Girl's name; aid (anag.)" , "musical princess" , "Trojan Mount; G&S Princess" .)