He attacks with wild Alsatians (9)
I believe the answer is:
assailant
'he attacks' is the definition.
(I've seen this before)
'wild alsatians' is the wordplay.
'wild' is an anagram indicator.
'alsatians' anagrammed gives 'ASSAILANT'.
'with' is the link.
(Other definitions for assailant that I've seen before include "One attacks" , "Aggressor" , "mugger, say" , "Who would tear into" , "who is on the offensive?" .)