Constant greeting in top style (9,4)
I believe the answer is:
permanent wave
'top style' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'constant greeting' is the wordplay.
'constant' becomes 'permanent' (I've seen this before).
'greeting' becomes 'wave' (gesture used as a greeting).
'permanent'+'wave'='PERMANENT WAVE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for permanent wave that I've seen before include "Hairstyle" , "hair style" , "Treatment for straight hair" .)