Type of combat in which rude man is involved (7)
I believe the answer is:
unarmed
'type of combat' is the definition.
(I've seen this before)
'rude man is involved' is the wordplay.
'is involved' indicates anagramming the letters (involved can mean confusing or complex).
'rude'+'man'='rudeman'
'rudeman' with letters rearranged gives 'UNARMED'.
'in which' acts as a link.
(Other definitions for unarmed that I've seen before include "Type of combat" , "Weaponless" , "Not carrying a weapon" , "Not bearing a weapon" , "Open" .)