Answer: icefree

AnswerCrossword Clue
ICEFREE

Navigable year-round

ICEFREE

Easy to navigate, in a way

ICEFREE

Like some northern ports

ICEFREE
Like Murmansk's harbor
ICEFREE
Clear, as winter windshields
ICEFREENavigable in winter, say
ICEFREEWithout frost
ICEFREESome winter ports
ICEFREEUnfrozen as a harbor
ICEFREELike some winter ponds