He could be French like William (6)
I believe the answer is:
norman
'he' is the definition.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for norman that I've seen before include "- Mailer, US author" , "Ten sixty six invader" , "Black Wednesday's Chancellor of the Exchequer" , "British comedian, once a cult figure in Albania, d. 2010" , "Boy's name" .)