A name made by collecting most litter (5)
I believe the answer is:
title
'a name' is the definition.
(title is a kind of name)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for title that I've seen before include "Rank < deed" , "Championship -- form of address" , "Name of book, picture or rank" , "'The name of a book, say (5)'" , "Chapter heading" .)