Get back? American in African country must get back (6)
I believe the answer is:
regain
'get back' is the definition.
(I've seen this before)
'get back? american in african country' is the wordplay.
'get back?' shows that the letters should be reversed in order (I've seen 'getting back' mean this).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'in' is an insertion indicator.
'african country' becomes 'niger' (Niger is an example).
'a' going into 'niger' is 'niager'.
'niager' reversed gives 'REGAIN'.
'must' acts as a link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for regain that I've seen before include "Get back, recover the use of" , "Get back (previously owned object)" , "Win back" , "Recover, retrieve" , "Take back (the Ashes, for example)" .)