In Svalbard, initially, outsiders may leave gloomy, badly-built huts (6)
I believe the answer is:
igloos
'huts' is the definition.
(I know this)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for igloos that I've seen before include "Ice houses for Eskimos" , "Housing" , "Ice homes for eskimos" , "Ice-houses for Inuits" , "Houses for Inuits" .)