Unreleased film clip issued by Nick (7)
I believe the answer is:
outtake
'unreleased film clip issued' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'by nick' is the wordplay.
'by' becomes 'out' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'nick' becomes 'take' (nick can informally mean to steal).
'out'+'take'='OUTTAKE'
Can you help me to learn more?
(Other definitions for outtake that I've seen before include "Recorded scene not included in final film" , "Cut scene" , "Scene filmed but not included in final version" , "part omitted from broadcast" , "Rejected film scene" .)