Distribute green bins — they're very green (9)
I believe the answer is:
beginners
'they're very green' is the definition.
(green can mean inexperienced)
'distribute green bins' is the wordplay.
'distribute' is an anagram indicator (I've seen this in other clues).
'green'+'bins'='greenbins'
'greenbins' is an anagram of 'BEGINNERS'.
(Other definitions for beginners that I've seen before include "Those at an early stage of learning" , "Novices" .)