Twist round internal organ? (6)
I believe the answer is:
oliver
'twist' is the definition.
(I've seen this in another clue)
'round internal organ?' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'internal organ?' becomes 'liver' (liver is a kind of internal organ).
'o'+'liver'='OLIVER'
(Other definitions for oliver that I've seen before include "Chef" , "Dickens boy named Twist" , "Dickens-based musical" , "-- Reed, actor" , "Musical based on the story of Dickens boy" .)