Win back article stolen by country after uprising (6)
I believe the answer is:
regain
'win back' is the definition.
(to win or capture again)
'article stolen by country after uprising' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'stolen by' means one lot of letters goes inside another (inserted letters are taken or stolen).
'country' becomes 'Niger' (African country).
'after uprising' says the letters should be written backwards (in a down clue, letters go up).
'a' placed inside 'niger' is 'niager'.
'niager' back-to-front is 'REGAIN'.
(Other definitions for regain that I've seen before include "Recover - in gear (anag)" , "Recover, retrieve" , "Win back" , "Get back, recover the use of" , "Get back (previously owned object)" .)