How to dispose of rubbish janitor regularly collects from scratch (2,6)
I believe the answer is:
ab initio
'from scratch' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ab initio that I've seen before include "From the start - in Latin" , "from scratch" , "From the beginning in Latin" , "Undercoat for metal/wood" , "from the outset" .)