Fighting fellow before party (5)
I believe the answer is:
kendo
'fighting' is the definition.
(I have seen 'Asian fighting' mean 'kendo' so perhaps 'fighting' could also mean 'kendo')
'fellow before party' is the wordplay.
'fellow' becomes 'ken' (I am not sure about this - if you are sure you should believe this answer much more).
'before' says to put letters next to each other.
'party' becomes 'do' (do can informally mean a party).
'ken'+'do'='KENDO'
Can you help me to learn more?
(Other definitions for kendo that I've seen before include "Asian fighting" , "Asian sport" , "Japanese martial art using split bamboo swords" , "Japanese fencing with bamboo swords" , "Fighting in Japan" .)