Also opposed to incorrect discharge (5)
I believe the answer is:
salvo
'discharge' is the definition.
(I've seen this before)
'also opposed to incorrect' is the wordplay.
'opposed to' becomes 'v' (abbreviation for versus).
'incorrect' is an anagram indicator.
'also'+'v'='alsov'
'alsov' is an anagram of 'SALVO'.
(Other definitions for salvo that I've seen before include "Burst of rapid fire" , "Sudden round of applause" , "What comes across" , "A volley of shots, perhaps as salute" , "Artillery salute" .)