Storm god not heartless (4)
I believe the answer is:
rant
'storm' is the definition.
(both can mean to rage)
'god not heartless' is the wordplay.
'god' becomes 'ra' (Egyptian god).
'heartless' says to hollow out the word (remove centre letters).
'not' with its centre removed is 'nt'.
'ra'+'nt'='RANT'
(Other definitions for rant that I've seen before include "Angry tirade" , "Speak intemperately" , "Wild speech" , "Angry outburst" , "End-of-course exams" .)