Plant part is said to be regenerated (10)
I believe the answer is:
aspidistra
'plant' is the definition.
(aspidistra is a kind of plant)
'part is said to be regenerated' is the wordplay.
'to be regenerated' is an anagram indicator.
'part'+'is'+'said'='partissaid'
'partissaid' is an anagram of 'ASPIDISTRA'.
(Other definitions for aspidistra that I've seen before include "Household growth" , "The biggest - (in the world) (Gracie Fields)" , "Houseplant of lily family" , "Huge house plant" , "something normally developed in-house?" .)