Primate, in practice, preceded by bishop, say (8)
I believe the answer is:
mandrill
'primate' is the definition.
(mandrill is a kind of primate)
'practice preceded by bishop say' is the wordplay.
'practice' becomes 'drill' ('drill' can be a synonym of 'practice').
'preceded by' says to put letters next to each other.
'bishop say' becomes 'man' (bishop is a kind of man).
'drill' after 'man' is 'MANDRILL'.
'in' acts as a link.
(Other definitions for mandrill that I've seen before include "Monkey with red and blue hindquarters" , "Large baboon" , "Baboon with colourful face" , "African baboon with red and blue muzzle and hindquarters" , "West African baboon-like primate" .)