Hairy brute first to attend rave in Oklahoma city, second to leave (9)
I believe the answer is:
tarantula
'oklahoma city second to leave' is the definition.
I can't tell whether this definition defines the answer.
'hairy brute first to attend rave in' is the wordplay.
'hairy brute' becomes 'tula' (I can't justify this - if you can you should give a lot more credence to this answer).
'first to' indicates taking the first letters.
'rave' becomes 'rant' (synonyms).
'in' is an insertion indicator.
The first letter of 'attend' is 'a'.
'a'+'rant'='arant'
'tula' going around 'arant' is 'TARANTULA'.
Can you help me to learn more?
(Other definitions for tarantula that I've seen before include "Crawler" , "web architect" , "Hairy arachnid" , "small, venomous creature" , "Large venomous spider" .)