Inferior bibles sermoniser purchases (6)
I believe the answer is:
lesser
'inferior' is the definition.
(I've seen this before)
'bibles sermoniser purchases' is the wordplay.
'purchases' indicates the answer is hidden within the clue (I've seen 'purchasing' mean this).
'LESSER' can be found hidden inside 'bibles sermoniser'.
(Other definitions for lesser that I've seen before include "Smaller in size or amount or value" , "Smaller; inferior" , "Smaller, minor" , "Not as great" , "That which is smaller, as of two evils" .)