Storm after hail is normal (7)
I believe the answer is:
average
'normal' is the definition.
('average' can be a synonym of 'normal')
'storm after hail' is the wordplay.
'storm' becomes 'rage' ('rage' can be a synonym of 'storm').
'after' says to put letters next to each other.
'hail' becomes 'ave' (I've seen this before).
'rage' put after 'ave' is 'AVERAGE'.
'is' is the link.
(Other definitions for average that I've seen before include "representative figure?" , "Mean; standard" , "Normal amount" , "mean maybe" , "Arithmetic mean" .)