His family includes a noted figure (5)
I believe the answer is:
kevin
'his' is the definition.
The definition suggests a singular noun which matches the answer.
'family includes a noted figure' is the wordplay.
'family' becomes 'kin' (synonyms).
'includes' is an insertion indicator.
'a noted figure' becomes 'ev' (I am not sure about this - if you are sure you should believe this answer much more).
'kin' enclosing 'ev' is 'KEVIN'.
Can you help me to learn more?
(Other definitions for kevin that I've seen before include "Mr Keegan?" , "- Costner, US actor (Dances with Wolves)" , "Man's name" .)