A pervert I smacked around's one out for booty (9)
I believe the answer is:
privateer
'booty' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'a pervert i smacked around's one out' is the wordplay.
'a pervert i' anagrams to 'PRIVATEER'.
But, I'm not sure how this is indicated.
'for' is the link.
Can you help me to learn more?
(Other definitions for privateer that I've seen before include "Sailor may go on it" , "Armed ship not owned by a government" , "Government-commissioned vessel authorised to prey on enemy shipping" , "Armed ship used in war but not government-owned" , "Drake, for example" .)