Cracked basin next to toilet pot (8)
I believe the answer is:
cannabis
'pot' is the definition.
('cannabis' can be a synonym of 'pot')
'cracked basin next to toilet' is the wordplay.
'cracked' indicates an anagram.
'next to' is a charade indicator (letters next to each other).
'toilet' becomes 'can' ('can' can be a synonym of 'toilet').
'basin' with letters rearranged gives 'nabis'.
'nabis' put after 'can' is 'CANNABIS'.
(Other definitions for cannabis that I've seen before include "Most commonly used (mostly) illicit drug" , "Strangely, Incas ban this drug" , "Smoked drug" , "Grass" , "Hash" .)