Aim to follow bishop and crook (4)
I believe the answer is:
bend
'crook' is the definition.
('bend' can be a synonym of 'crook')
'aim to follow bishop' is the wordplay.
'aim' becomes 'end' (I've seen this before).
'to follow' says to put letters next to each other.
'bishop' becomes 'b' (abbreviation used in chess).
'end' put after 'b' is 'BEND'.
'and' acts as a link.
(Other definitions for bend that I've seen before include "Dish of raw vegetables" , "Curve; knot" , "Crouch" , "It may be sinister" , "Repair" .)