Stole across border, one in a former country (7)
I believe the answer is:
bohemia
'former country' is the definition.
'bohemia' can be an answer for 'country' (I've seen this before). I'm unsure of the 'former' bit.
'stole across border one' is the wordplay.
'stole' becomes 'boa' (both can mean a type of scarf).
'across' means one lot of letters goes inside another.
'border' becomes 'hem' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'hem'+'i'='hemi'
'boa' placed around 'hemi' is 'BOHEMIA'.
'in a' is the link.
Can you help me to learn more?
(Other definitions for bohemia that I've seen before include "quarter of artists" , "District for unconventional people - former European kingdom" , "province of Europe" , "European region" , "Region of central Europe" .)