A cream roll in the hands of the one calling the shots (6)
I believe the answer is:
camera
'the hands of the one calling the shots' is the definition.
I can't tell whether this definition defines the answer.
'a cream roll in' is the wordplay.
'roll' indicates an anagram.
'in' indicates putting letters inside.
'cream' is an anagram of 'cmera'.
'a' going within 'cmera' is 'CAMERA'.
Can you help me to learn more?
(Other definitions for camera that I've seen before include "Apparatus for photographer" , "one that produces pictures" , "TV studio item" , "brownie perhaps" , "Bringing equipment for producing pictures" .)