Get back American trapped in African country undergoing revolution (6)
I believe the answer is:
regain
'get back' is the definition.
(I've seen this before)
'in african country undergoing revolution' is the wordplay.
'in' is an insertion indicator.
'african country' becomes 'Niger' (country in Africa).
'undergoing' becomes 'a' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'revolution' says the letters should be written in reverse.
'niger' enclosing 'a' is 'niager'.
'niager' back-to-front is 'REGAIN'.
'american trapped' acts as a link.
This may not be right. Some or all of 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 "Recover, retrieve" , "Get back (previously owned object)" , "Take back (the Ashes, for example)" , "Possess once more for regina" , "Recover - in gear (anag)" .)