Second aggressive fellow’s punky hairdos (7)
I believe the answer is:
mohawks
'hairdos' is the definition.
(I know this)
'second aggressive fellow's punky' is the wordplay.
'second' becomes 'mo' (both are short periods of time).
'aggressive fellow's punky' becomes 'hawks' (I can't justify this - if you can you should believe this answer much more).
'mo'+'hawks'='MOHAWKS'
Can you help me to learn more?
(Other definitions for mohawks that I've seen before include "American Indians; skating steps" , "Iroquois" , "Movements on 12" .)