Word derived from a name (6)
I believe the answer is:
eponym
'word derived from a name' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eponym that I've seen before include "someone giving a name" , "Distinguishing title; derived name" , "Word derived from person's name or placename" , "a mackintosh, for instance" , "eg 'Jane Eyre'" .)