Norwegian inlets (6)
I believe the answer is:
fjords
'norwegian inlets' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fjords that I've seen before include "More than one Channel" , "Scandinavian inlets" , "Norwegian inlets of the sea" , "Long narrow sea inlets between steep cliffs in Norway" , "Rock-bound inlets" .)