Prepare insufficiently maybe for one style of bowling (8)
I believe the answer is:
underarm
This clue is a double definition.
'prepare insufficiently maybe' is the first definition.
(arm insufficiently)
'one style of bowling' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for underarm that I've seen before include "poor delivery" , "Soft type of bowling or serve" , "With hand below the shoulder (of bowling or serving)" , "Neglect service" , "Style of service in" .)