Country flag raised over a little streamer (7)
I believe the answer is:
eritrea
'country' is the definition.
(I know that Eritrea is African country)
'flag raised over a little streamer' is the wordplay.
'flag' becomes 'tire' (both can mean to become weary).
'raised' says the letters should be written backwards (going up in a down clue).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'a little streamer' becomes 'rea' (I can't justify this - if you can you should give a lot more credence to this answer).
'tire' reversed gives 'erit'.
'erit'+'rea'='ERITREA'
Can you help me to learn more?
(Other definitions for eritrea that I've seen before include "Eire art (anag)" , "Country bordering the Red Sea" , "nation" , "NE African state" , "North-east African state" .)