In Verdun Clemenceau has a relative (5)
I believe the answer is:
uncle
'a relative' is the definition.
(uncle is a kind of relative)
'in verdun clemenceau has' is the wordplay.
'has' indicates a hidden word.
'UNCLE' is hidden in the letters of 'in verdun clemenceau'.
(Other definitions for uncle that I've seen before include "Sam, perhaps" , "For example, Tom Cobbleigh" , "One receiving pawn" , "takes the pledge" , "Dad's brother" .)