I leave African capital with second Mediterranean tree pod (5)
I believe the answer is:
carob
'tree pod' is the definition.
(I've seen this in another clue)
'i leave african capital with second mediterranean' is the wordplay.
'leave' indicates named letters should be taken away.
'african capital' becomes 'cairo' (capital of Egypt).
'with second mediterranean' becomes 'b' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cairo' with 'i' taken away is 'caro'.
'caro'+'b'='CAROB'
Can you help me to learn more?
(Other definitions for carob that I've seen before include "Bean, a choc. substitute" , "St John's bread" , "Locust tree" , "Saint John's bread" , "(Seeds yielding) powder used as a chocolate substitute" .)