Pot (4)
'pot' is the definition.
(synonyms)
This is all the clue.
(Other definitions for weed that I've seen before include "Marijuana (slang)" , "Useless plant - useless person" , "Unwanted plant - cannabis" , "Hoe to remove it" , "nuisance in bed" .)
(Other definitions for clay that I've seen before include "Soft wet earth that can be fired" , "Human body" , "Court surface" , "Muhammad Ali's original surname" , "Earth, soil" .)
'pot' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for crucible that I've seen before include "Metal-melting container" , "Melting-pot" , "Miller's bewitching play" , "Trial" , "Container for melting metals" .)