Banking controller delights bloodsucker (8)
I believe the answer is:
joystick
'banking controller' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'delights bloodsucker' is the wordplay.
'delights' becomes 'joys' (I've seen this before).
'bloodsucker' becomes 'tick' (I've seen this in another clue).
'joys'+'tick'='JOYSTICK'
Can you help me to learn more?
(Other definitions for joystick that I've seen before include "girl's to click" , "Pilot's manual control" , "Flight control lever" , "Aircraft's control lever" , "Manual computer game gadget" .)