Pot or tin basin broken (8)
I believe the answer is:
cannabis
'pot' is the definition.
('cannabis' can be a synonym of 'pot')
'tin basin broken' is the wordplay.
'tin' becomes 'can' ('can' can be a synonym of 'tin').
'broken' indicates anagramming the letters.
'basin' anagrammed gives 'nabis'.
'can'+'nabis'='CANNABIS'
'or' is the link.
(Other definitions for cannabis that I've seen before include "Ban Incas from using this drug" , "Most commonly used (mostly) illicit drug" , "Hash" , "Strangely, Incas ban this drug" , "Hemp plant, illegal intoxicant drug" .)