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' is an anagram indicator (involved can mean confusing or complex).
'rude'+'man'='rudeman'
'rudeman' is an anagram of 'UNARMED'.
'in which' is the link.
(Other definitions for unarmed that I've seen before include "Type of combat" , "Weaponless" , "Not carrying a weapon" , "Not bearing a weapon" , "Open" .)