Container is in African port (5)
I believe the answer is:
tunis
'african port' is the definition.
(port in Tunisia)
'container is' is the wordplay.
'container' becomes 'tun' (tun is a kind of container).
'tun'+'is'='TUNIS'
'in' acts as a link.
(Other definitions for tunis that I've seen before include "North African location" , "Tom, Dick or Harry" , "I stun (anag) - port and capital" , "North African city" , "Mediterranean capital and port" .)