Save new building in the countryside? (4)
I believe the answer is:
barn
'building in the countryside?' is the definition.
'save new' is the wordplay.
'save' becomes 'bar' (I've seen this before).
'new' becomes 'n'.
'bar'+'n'='BARN'
(Other definitions for barn that I've seen before include "Farm store" , "Bran stored in farm shed" , "Large farm building" , "spacious accommodation" , "Farm 4 down" .)