Start to "starter" (3)
I believe the answer is:
non
'start to starter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for non that I've seen before include "Prefix meaning negative" , "Combining form meaning not" , "Prefixed negation of a word" , "- - -stick" , "Negative French word" .)