A vegetarian wouldn't take it from a Labour leader (5)
I believe the answer is:
offal
'a vegetarian wouldn't take it' is the definition.
I can't judge whether this defines the answer.
'from a labour leader' is the wordplay.
'from' becomes 'off' (I've seen this in other clues).
'labour leader' becomes 'l' (the leading letter of 'labour').
'off'+'a'+'l'='OFFAL'
Can you help me to learn more?
(Other definitions for offal that I've seen before include "Heart, liver, kidney etc" , "Liver, lights, etc" , "Less edible parts of animal, entrails and organs" , "Animal entrails and internal organs - worthless" , "Edible internal parts" .)