Oh boy, all wrestling is the epitome of hype (8)
I believe the answer is:
ballyhoo
'hype' is the definition.
('ballyhoo' can be a synonym of 'hype')
'oh boy all wrestling' is the wordplay.
'wrestling' indicates anagramming the letters.
'oh'+'boy'+'all'='ohboyall'
'ohboyall' anagrammed gives 'BALLYHOO'.
'is the epitome of' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for ballyhoo that I've seen before include "fuss about nothing?" , "Noisy confused situation" , "Noisy uproar - blatant publicity" , "Exaggerated fuss" , "Hubbub" .)