Simultaneous discharge from colossal volcanoes (5)
I believe the answer is:
salvo
'simultaneous discharge' is the definition.
'salvo' can be an answer for 'discharge' (I've seen this before). I am not certain of the 'simultaneous' bit.
'from colossal volcanoes' is the wordplay.
'from' indicates a hidden word.
'SALVO' is hidden in the letters of 'colossal volcanoes'.
Can you help me to learn more?
(Other definitions for salvo that I've seen before include "Rounds delivered" , "Simultaneous burst of gunfire" , "Simultaneous artillery fire" , "Simultaneous discharge of fire" , "Burst of firing" .)