Discharge Vietnamese leader in Laos settlement (5)
I believe the answer is:
salvo
'discharge' is the definition.
(I've seen this before)
'vietnamese leader in laos settlement' is the wordplay.
'leader' says to take the initial letters.
'in' means one lot of letters goes inside another.
'settlement' indicates anagramming the letters.
The initial letter of 'vietnamese' is 'v'.
'laos' is an anagram of 'salo'.
'v' placed inside 'salo' is 'SALVO'.
(Other definitions for salvo that I've seen before include "Fiery outburst" , "Burst of firing" , "Firing of guns as a salute" , "Simultaneous discharge of artillery" , "concentrated fire" .)