Oliver's unforeseen developments (6)
I believe the answer is:
twists
'developments' is the definition.
(I know this)
'oliver's unforeseen' is the wordplay.
'oliver' becomes 'twist' (I've seen this before).
'unforeseen' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'twist'+'s'='TWISTS'
Can you help me to learn more?
(Other definitions for twists that I've seen before include "Wrenches round" , "Twines together" , "Rotates; distorts" , "gets another card turned over" , "Dances and turns as Chubby Checker used to" .)