Simultaneous artillery launches, very offensive initially (5)
I believe the answer is:
salvo
'simultaneous artillery launches very offensive initially' is the definition.
I can't tell whether this defines the answer.
'simultaneous artillery launches very offensive initially' is the wordplay.
'initially' says to take the initial letters.
The first letters of 'simultaneous artillery launches very offensive' is 'SALVO'.
Can you help me to learn more?
(Other definitions for salvo that I've seen before include "Discharge of weapons in unison" , "Discharge of gunfire" , "A simultaneous salute of guns" , "concentrated fire" , "Burst of fire from several guns" .)