Wrong greeting creates rise in felonies (5,4)
I believe the answer is:
crime wave
'rise in felonies' is the definition.
'crime wave' can be an answer for 'rise' (crime wave is a kind of rise). I am not certain of the 'in felonies' bit.
'wrong greeting' is the wordplay.
'wrong' becomes 'crime' (I've seen this before).
'greeting' becomes 'wave' (I've seen this before).
'crime'+'wave'='CRIME WAVE'
'creates' is the link.
Can you help me to learn more?
(Other definitions for crime wave that I've seen before include "Sudden rise in illegal acts" , "Upsurge in wrongdoing" , "multitude of sins" , "Sudden rise in offences" , "Surge in lawbreaking" .)