Scion is last of famous Victorian (5)
I believe the answer is:
sprig
'scion' is the definition.
(thesaurus)
'last of famous victorian' is the wordplay.
'last of' suggests the final letters.
'victorian' becomes 'prig' (both can mean a prudish person).
The last letter of 'famous' is 's'.
's'+'prig'='SPRIG'
'is' is the link.
(Other definitions for sprig that I've seen before include "A tack; a little shoot" , "Small stem taken from a bush or plant" , "Small stem with leaves or flowers" , "Small spray of leaves or flowers" , "Young family member; small stem" .)