Right morning leaf storm (7)
I believe the answer is:
rampage
'storm' is the definition.
(I've seen this in another clue)
'right morning leaf' is the wordplay.
'right' becomes 'r' (abbreviation).
'morning' becomes 'am' (as in 12:00 AM).
'leaf' becomes 'page' (page is a kind of leaf).
'r'+'am'+'page'='RAMPAGE'
(Other definitions for rampage that I've seen before include "Fury" , "Violent disorder" , "Go berserk" , "Rioting, for example" , "Run wild" .)