Algerian port managed by outstanding leader (4)
I believe the answer is:
oran
'algerian port' is the definition.
(I've seen this before)
'managed by outstanding leader' is the wordplay.
'managed' becomes 'ran' (both can mean organised or was in charge of).
'by' is a charade indicator (letters next to each other).
'leader' indicates taking the first letters.
The initial letter of 'outstanding' is 'o'.
'ran' after 'o' is 'ORAN'.
(Other definitions for oran that I've seen before include "Algerian seaport" , "Algerian port" , "African port" .)