Vegetarians wouldn't take it from a mere novice (5)
I believe the answer is:
offal
'vegetarians wouldn't take it' is the definition.
I can't tell whether this definition defines the answer.
'from a mere novice' is the wordplay.
'from' becomes 'off' (I've seen this in other clues).
'mere novice' becomes 'l' (abbreviation for Learner e.g. on UK cars. I am not sure about the 'mere' bit.).
'off'+'a'+'l'='OFFAL'
Can you help me to learn more?
(Other definitions for offal that I've seen before include "Internal organs and entrails as food" , "Butcher's leftovers" , "Bits of waste meat" , "Liver, lights, etc" , "Less valuable edible parts of animal" .)