Ordinary storm after hail in Rome (7)
I believe the answer is:
average
'ordinary' is the definition.
(I know that ordinary can be written as average)
'storm after hail in rome' is the wordplay.
'storm' becomes 'rage' (synonyms).
'after' says to put letters next to each other.
'hail in rome' becomes 'ave' (I've seen this in another clue).
'rage' put after 'ave' is 'AVERAGE'.
(Other definitions for average that I've seen before include "Normal amount" , "Normal; mean" , "The statistical norm" , "Normal in arithmetic way" , "Arithmetic mean" .)