Style of pot covered by cannabis questionnaire (6)
I believe the answer is:
bisque
'style of pot' is the definition.
(bisqueware is a type of pottery)
'covered by cannabis questionnaire' is the wordplay.
'covered by' says the answer is hidden in the clue.
'BISQUE' is hidden within 'cannabis questionnaire'.
(Other definitions for bisque that I've seen before include "golf handicap" , "Rich soup made from shellfish" , "Thick shellfish soup" , "Creamy soup" , "Cream soup made with shellfish" .)