Capital on the Hudson (6)
I believe the answer is:
albany
'capital on the hudson' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for albany that I've seen before include "duke" , "and a third" , "US state capital" , "Husband of Goneri (Lear)" , "Capital of New Yorki state" .)