A soldier overhauled latrines in cold blockhouses (6)
I believe the answer is:
igloos
'cold blockhouses' is the definition.
'a soldier overhauled latrines' is the wordplay.
'a soldier' becomes 'gi' (government issue or general issue).
'overhauled' shows that the letters should be reversed in order.
'latrines' becomes 'loos'.
'gi' reversed gives 'ig'.
'ig'+'loos'='IGLOOS'
'in' is the link.
(Other definitions for igloos that I've seen before include "Dome-shaped Inuit houses" , "Inuit houses made from blocks of snow" , "Frozen homes for Eskimos (6)" , "homes up north" , "Ice houses for Eskimos" .)