Shoot a descendant (5)
I believe the answer is:
scion
I believe this is a double definition.
'shoot' is the first definition.
(thesaurus)
'a descendant' is the second definition.
(scion is a kind of descendant)
(Other definitions for scion that I've seen before include "Younger member of a family" , "Descendent - heir" , "Young shoot/twig" , "one of a long line" , "Young shoot or twig" .)