Country shack in restriction (6)
I believe the answer is:
bhutan
'country' is the definition.
(I know that Bhutan is a country)
'shack in restriction' is the wordplay.
'shack' becomes 'hut' (synonyms).
'in' indicates putting letters inside.
'restriction' becomes 'ban' (a ban is a restriction on something).
'hut' going within 'ban' is 'BHUTAN'.
(Other definitions for bhutan that I've seen before include "Asian kingdom" , "Bowman" , "Small country" , "kingdom near China" , "Himalayan kingdom" .)