Dar es Salaam sadly lacking sales fleet (6)
I believe the answer is:
armada
'fleet' is the definition.
(armada is a kind of fleet)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for armada that I've seen before include "lot of craft" , "Large number of ships (Spanish?)" , "Large Spanish fleet" , "force of the sea" , "A great fleet - Spain had one" .)