Soldiers welcome a good storm (4)
I believe the answer is:
rage
'storm' is the definition.
('rage' can be a synonym of 'storm')
'soldiers welcome a good' is the wordplay.
'soldiers' becomes 're' (Royal Engineers).
'welcome' is an insertion indicator (in sense of 'inviting in').
'a good' becomes 'ag' (I've seen this in other clues**).
're' placed around 'ag' is 'RAGE'.
(Other definitions for rage that I've seen before include "Uncontrollable anger" , "Gear up in violent temper" , "Fury - fashion" , "a poetic response to dying light?" , "Cult - passion" .)