Everything in the pot can be eaten by a vegetarian (7)
I believe the answer is:
shallot
'be eaten by a vegetarian' is the definition.
I can't judge whether this defines the answer.
'everything in the pot' is the wordplay.
'everything' becomes 'all' (all things).
'in' indicates putting letters inside.
'the pot' becomes 'shot' (I am not sure about this - if you are sure you should believe this answer much more).
'all' put inside 'shot' is 'SHALLOT'.
'can' is the link.
Can you help me to learn more?
(Other definitions for shallot that I've seen before include "Type of 12" , "Scallion" , "One may get into a stew" , "Onion-like plant with clusters of bulbs" , "Edible onion-like bulb" .)