It's fun wrestling with one's peers (5)
I believe the answer is:
spree
'it's fun wrestling' is the definition.
I can't judge whether this defines the answer.
'one's peers' is the wordplay.
'peers' can be anagrammed to 'SPREE'.
Though, I am unsure how this is indicated.
'with' is the link.
Can you help me to learn more?
(Other definitions for spree that I've seen before include "Overindulgent bout" , "Wild spell of spending or drinking" , "Revel" , "Drunken bout" , "booze-up?" .)