Can new basin be pot? (8)
I believe the answer is:
cannabis
'be pot?' is the definition.
(I've seen this before)
'can new basin' is the wordplay.
'new' indicates anagramming the letters.
'basin' anagrammed gives 'nabis'.
'can'+'nabis'='CANNABIS'
(Other definitions for cannabis that I've seen before include "Soft drug" , "Ban Incas from using this drug" , "Grass" , "Pot" , "Most commonly used (mostly) illicit drug" .)