Fjord kin (3)
I believe the answer is:
ria
'fjord kin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ria that I've seen before include "Submerged valley" , "Institution for the promotion of art, in short" , "Little girl" , "Drowned coastal valley" , "Drowned river valley now an inlet of the sea" .)